Merge pull request #105 from cs2103aug2014-w15-3J/master

Merge Logic with Master
Merge pull request #106 from cs2103aug2014-w15-3J/master

CompareTo implemented in DateTime.java
Merge pull request #107 from cs2103aug2014-w15-3J/master

added in searchfree command    format searchfree <date>   or searchfree ...
Implemented searchFreeSlots. limited testing, requires more knowledge of
parser commands.
Merge pull request #108 from cs2103aug2014-w15-3J/master

Merge Logic with Master
Merge pull request #109 from cs2103aug2014-w15-3J/master

Merge Logic with Master
Merge pull request #110 from cs2103aug2014-w15-3J/master

Merge Logic with Master
Error in isExpired. Resolved
fully implemented searchForFreeSlots. Allows searching for free slots
and taking it
Merge pull request #111 from cs2103aug2014-w15-3J/Logic

Merge Master with Logic
Added CRU operations in searchForFreeSlots display. Requires testing.
display for free slot
refactor
improving code quality
support use of TAB to switch between tabs
get rid of magic strings
Added undo support for tick command
Allows normal operations on searchFreeSlots display and show up to date
information
Merge branch 'Logic' of https://github.com/cs2103aug2014-w15-3J/Ticker.git into Logic
fix a minor bug in view