Removed irrelevant import
Imported library for Natty Date Parser
Nothing committed
Added casting constructor
Merge branch 'master' of https://github.com/cs2103aug2014-w13-2j/main.git
Corrected a test case for add command
Merge branch 'master' of https://github.com/cs2103aug2014-w13-2j/main.git
Added new commandType
Added ORDER_BY OptionType and documenting the enum class
Refactored extraction of all aliases RegEx to OptionType
Added more test case for natural language of Date
Added support to new Search Command
Added casting constructor