add right_align option

[chrisphilip322]

I prefer to have the indention character on the right side of the indent rather than on the left. This small change adds an option that lets you choose to right align the character instead of left align it.

1. Left align, first indent on, no regression

// let g:indentLine_showFirstIndentLevel = 1
// " let g:indentLine_right_align = 1       
// let g:indentLine_first_char = '·'        
// let g:indentLine_char = '·'              
                                            
#include <stdio.h>                          
                                            
int main(int argc, char **argv) {           
· for(int i=0; i < 20; i++) {               
· · if(i % 15 == 0) {                       
· · · printf("fizzbuzz\n");                 
· · } else if(i % 5 == 0) {                 
· · · printf("buzz\n");                     
· · } else if(i % 3 == 0) {                 
· · · printf("fizz\n");                     
· · } else {                                
· · · printf("%d\n", i);                    
· · }                                       
· }                                         
}                                           

2. Left align, no first indent, no regression

// let g:indentLine_showFirstIndentLevel = 0
// " let g:indentLine_right_align = 1       
// let g:indentLine_first_char = '·'        
// let g:indentLine_char = '·'              
                                            
#include <stdio.h>                          
                                            
int main(int argc, char **argv) {           
  for(int i=0; i < 20; i++) {               
  · if(i % 15 == 0) {                       
  · · printf("fizzbuzz\n");                 
  · } else if(i % 5 == 0) {                 
  · · printf("buzz\n");                     
  · } else if(i % 3 == 0) {                 
  · · printf("fizz\n");                     
  · } else {                                
  · · printf("%d\n", i);                    
  · }                                       
  }                                         
}                                                                                

3. Right align, first indent, new feature

// let g:indentLine_showFirstIndentLevel = 1
// let g:indentLine_right_align = 1         
// let g:indentLine_first_char = '·'        
// let g:indentLine_char = '·'              
                                            
#include <stdio.h>                          
                                            
int main(int argc, char **argv) {           
 ·for(int i=0; i < 20; i++) {               
 · ·if(i % 15 == 0) {                       
 · · ·printf("fizzbuzz\n");                 
 · ·} else if(i % 5 == 0) {                 
 · · ·printf("buzz\n");                     
 · ·} else if(i % 3 == 0) {                 
 · · ·printf("fizz\n");                     
 · ·} else {                                
 · · ·printf("%d\n", i);                    
 · ·}                                       
 ·}                                         
}                                           

4. Right align, no first indent, new feature

// let g:indentLine_showFirstIndentLevel = 1
// let g:indentLine_right_align = 1         
// let g:indentLine_first_char = '·'        
// let g:indentLine_char = '·'              
                                            
#include <stdio.h>                          
                                            
int main(int argc, char **argv) {           
  for(int i=0; i < 20; i++) {               
   ·if(i % 15 == 0) {                       
   · ·printf("fizzbuzz\n");                 
   ·} else if(i % 5 == 0) {                 
   · ·printf("buzz\n");                     
   ·} else if(i % 3 == 0) {                 
   · ·printf("fizz\n");                     
   ·} else {                                
   · ·printf("%d\n", i);                    
   ·}                                       
  }                                         
}