Translations extractor

Changelog

[b3db082] minor #79 Simplify require-dev dependencies (@IndraGunawan)
[a698e31] minor #80 group generated type class by namespace (@IndraGunawan)
[6cfee92] feature #81 Add symfony translation extractor (@danut007ro)
[f4f9c91] minor #82 Minor translation extractor config enhancements (@ogizanagi)