Fixed dependencies and travis configuration

Fixed library dependency (#21)

* refactored tests and tweaked composer

* improved travis config

* fixed dependency

Fixed several composer issues

Also skipped several minor versions to keep up with the library package

Fixed import bug

Sorry if any of you had issues with this, I've made sure this won't happen again by adding a test for it

Further improved mock_api_client service and tests

0.15.3

improved compiler test

Few fixes and doc updates

Also added a service for the MockApiClient class, to make a user's functional tests easier (if they use the ApiClient during their tests).

More fixes and refactorings

• Dropped factory due to maintainability issues
• Fixed to invalid/missing service definitions
• Updated to use the latest cleentfaar/slack version (~0.15.1)

Updates due to refactoring

Fixed standing issues and changes for the refactored slack library

Service fixes

0.14.2

fixed services

Refactored for new library version

0.14.1

updated dependency

0.13.2

updated slack dependency