fixed undo bugs, now doing an action that writes to the file will clear all redos
created instantSearch method in InputFieldViewManager
removed test comments from KeywordDetector
added getter and setter for selectIndex in Keyword Class
changed keyworddetector to a simpleton
KeywordDetector now changes selectIndex in InputFieldViewManager
removed setKeywords from getKeywords in CommandParser
removed all keyword selectindex code
added getter for taskData in TaskListViewManager
implemented instant task cell highlighting for update/delete/done/undone
implemented getTasksStartingFrom, getTasksEndingBy, getTasksWithinDateRange in TaskController
set default sorting style
implemented dividers for undone tasks (default view)
Merge branch 'staging' of https://github.com/cs2103aug2014-w13-1c/main into jolly/gui
changed getLastModifiedIndex to getLastModifiedUUID in TaskController
disabled dividers for now, commented out scrollToLastModifiedTask in TaskListViewManager