phpdoc updates
Lots of low-hanging phpdoc
Add commentExpirationDate and recentCommentDate accessors
Add applyParams method to Entry model
Rename Assets model to Asset
Doc up the collection classes
Refactor hydrator method signatures
Add summary to matrixCols and gridCols EntryCollection properties
PHPdoc
Add collection classes for GridCol and MatrixCol
PHPdocs
Add custom collection classes for MatrixRow, GridRow and File
Finish up PHPdoc
Update README