- Added few more convenience shortcuts
 - Removed simple "value" getter since only few cell types supports it
 - Cell value mutators changed to comply with Scala Naming Conventions:
http://docs.scala-lang.org/style/naming-conventions.html
Reworked CellType support to Scala-flavoured one
Removed redundant utility methods, sightly improved imports
Version bumped to 1.1, updated README