Version v0.0.5.
Merge pull request #21 from futoase/release/0.0.5

Version v0.0.5.
Modified: Improved repository.
Merge pull request #22 from futoase/feature/improved-repository

Modified: Improved repository.
Created: Add Gast::Base. Move from function of initialize to Gast::Base.
Merge pull request #23 from futoase/feature/add-gast-base

Created: Add Gast::Base. Move from function of initialize to Gast::Base.
Version v0.0.6.
Merge pull request #24 from futoase/release/0.0.6

Version v0.0.6.
Modified: Improved before filter.
Merge pull request #25 from futoase/feature/improved-before-filter

Modified: Improved before filter.
Version v0.0.7.
Merge pull request #26 from futoase/release/0.0.7

Version v0.0.7.