Squashed 'src/Pingpong/Generators/' changes from 5560434..cda0a9c
Squashed 'src/Pingpong/Generators/' changes from 5560434..cda0a9c

cda0a9c add support for converting string of migration to a stub script
b932d51 docblock
46e176b Add migration parser

git-subtree-dir: src/Pingpong/Generators
git-subtree-split: cda0a9cd1e64321d0da3f315c79fdda4c7bc8864

pingpong-labs/sky,pingpong-labs/sky,pingpong-labs/sky