Merge pull request #45 from chives/dev

Translatable QueryBuilder with common query building logic, TranslatableRepository findTranslatable*() methods
Merge pull request #46 from chives/dev

Added php 5.6 and hhvm to travis build matrix
Updated dev dependincies
Increased code coverage by tests
TranslatableListener heavy refactor
Fixed renumbering file if already exists
TranslatableListener uses TranslatableRepository now to implement common logic
Rebase fix
Unified fixture classes
Merge pull request #44 from chives/dev-translatable

TranslatableListener heavy refactoring
Updated installation doc