Used parser
Merge branch 'controller/sharon'
Activated help
fix nullpointer in taskimpl
Activated undo
Merge remote-tracking branch 'origin/logic/wenhao'
Merge remote-tracking branch 'origin/controller/sharon' into logic/wenhao
Fix FIELD_COUNT
Merge remote-tracking branch 'origin/logic/wenhao'
Fixed bug
Merge branch 'master' into logic/wenhao
Add "delete all"
Added Date
Implemented output for undo
Fix bug with Undo. Issue #61
Merge remote-tracking branch 'origin/ui/victor' into logic/wenhao
Refactored output javadoc
Added parser to parse from string to a date object.
Refer to https://docs.google.com/spreadsheets/d/1A_enIhjFT220EPobggQ3lZ3hyz3evQ9SVA_b3iCm2ko/edit#gid=0
for the list of acceptable date formats

#40
Merge branch 'master' into parser/Victor
Executable