Introduce AssertionChain, returned from Assert\that() function.
Add ->nullOr() and ->all() modes on AssertionChain.
Update README.md with \Assert\that() api.
Add generator for @method docs to make IDE users happy.
Generate @method docs first time.
Fix assumptions about Assert\Assertion code generation.
Generate new method docblocks for Assertion
Add \Assert\ThatNullOr and \Assert\ThatAll functions.
Merge pull request #46 from beberlei/AssertThat

\Assert\that() fluent API for validation