Select Observations remove blank lines, Select Observations add Recent option

Select Observations Page:     Remove blank lines
     Drop blank lines for Locations W/O Observations
ObservationsIndexViewController Class:
1/ initWithStyle method
    Filter out Locations W/O Observations

Select Location Page:    Add Recent Option.
      Displays the most recently used 20 locations.
StationsIndexViewController Class:
1/ Add Recent Bar Button
2/ Add doRecent method toggles between
      All and Recent Stations arrays
3/ Add getRecentStations
     Gets LRU Station names
     Builds Recent Station arrays
4/ Mod didSelectRow method
    Add Save Station Name.
5/ Mod doFind method
    Add select All Stations
NBSettings Class:
1/ Add recentNames list
2/ Add get names method
3/ Add addName method

View and Edit Observations:  Ensure Edits are saved
1/ Modify Back button
2/ Add onBack method
     If in Edit mode do FSStore saveChanges
3/ Mod onEdit method
    If in Edit mode set Back button title to Save
Centralize Buttons when screen is rotated

Centralize Buttons when screen is rotated.

HomeViewController Class
Drop left and right constrains in Autosizing box
For all buttons

TransmitViewControolerClass
Drop left and right constrains in Autosizing box
For all buttons
Merge pull request #14 from NatureBridge/Richard6

Centralize Buttons when screen is rotated