Merge pull request php-translation#144 from Nyholm/2.0

Update 2.0.0 Changelog.md

Prevent crash when getting callerName (php-translation#120)

* Prevent crash when getting callerName

* Code cleanup

* Added change log

Added change log for 1.7.0 (php-translation#119)

Added change log for 1.6 (php-translation#116)

Fatal Error from FormTypeImplicit when using method call from variable (

php-translation#105)

* Issue php-translation#104 : calling method contained in variable (in Form context) causes parsing process to raise "Catchable Fatal Error: Object of class PhpParser\Node\Expr\Variable could not be converted to string"

* Issue php-translation#104 : code style fix

* Issue php-translation#104 : code style fix

* changes requested by @Nyholm during review

Prepare for 1.5.1 (php-translation#103)

Added changelog (php-translation#100)

Prepare for 1.4.0 (php-translation#75)

Allow Symfony 2.7

Adding support for @desc annotation (php-translation#63)

* Adding support for @desc annotation

* style fixes

* Removed strict types

* Added changelog

* Added twig filter

* Applied changes from StyleCI

* Minor

* Test on twig 1