Fixed bugs related to UI on other devices with Android Froyo..

Tested on MDPI device running Android Froyo (API level 7), Some layout
changes have been made.
Domain is moved to NetworkConnection Handler
A lot of Refactoring of Code  is made..
UI enhancements 
--borders and shadows..
Introduced Exceptions
reference to Activity in Session handler is removed.
it uses only Context to access Shared preferences
login feature improved - shows result on screen
Proper Documentation is done and Unnecessary content removed.
LoginActivity is shown as dialog box
UI enhancements
-Login screen is modified.
-List items with shadows.
-Border reduced to 1dp.
Retry Dialog added..
2 changes- Re-sending request, OnResponseRecievedListener
Re-sending request feature added to Chef class.
OnResponseRecievedListener applied to MainActvity and
OpportunityListBuilder
List UI enhanced with pressed states
Retry functionality working
Front - end for Activity Schedules are completed
..
,.
added refresh functionality for all pages
Datepicker added, listener now contains getContext()
Merge pull request #9 from mittu-spidey/master

Version 0.0