remove outdated "button" project
using xml menu for context menu and implemented handlers to delete/edit recording
fixed ListView to properly refresh after a recording is deleted
improved EditRecordingActivity to actually load and save the data
added TimePickerDialogs and DatePickerDialogs to edit Recording
added check for consistency to setStart() and setEnd() of Recording
dynamically adjust recording's start/end time if the newly selected time is inconsistent (start after end)
fixed taskSelection dropdown to be displayed on first click
close Activity after saving Task
Updated Edit_Task, List_Task and Statistics Activity.
Added charting library
Merge branch 'master' of https://github.com/MC-Timetracker/timetracker
Debugged manifest file and updated Edit Task
Debugged classpath file
Colors file added

XML file for colors
added color list file
removed color file
Merge branch 'master' of https://github.com/MC-Timetracker/timetracker
Updated Statistics and main Activity
Updated statistics and main activity