change color for empty slot
Merge branch 'UI'
TimedTask toString() changed
Parser test updated
search for free slots date assumed to be today if no date specified
Merge branch 'parser'
typo fixed for searchf
Merge pull request #132 from cs2103aug2014-w15-3J/Logic

Merge pull request #131 from cs2103aug2014-w15-3J/master
Merge pull request #133 from cs2103aug2014-w15-3J/master

Merge Logic with Master