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