patch for wifi lock issue observed in #56.

@eyedol went ahead and created a proper branch for this patch, hopefully
more useful to you. tested in emulator on Android 2.3.
Merge pull request #57 from mandric/issue-56

patch for wifi lock issue observed in #56.
added isHeld() checks when acquiring wake and wifi locks in SmsSyncServices.
Merge pull request #62 from mandric/issue-56

added isHeld() checks when acquiring wake and wifi locks in SmsSyncServices
Simplified README

to remove duplicate information that can be found elsewhere.
Merge branch 'master' of https://github.com/olliebennett/SMSSync
Renamed README to enable markdown parsing
Improved wording and fixed typos in string.xml

... now conforms better to design guidelines at
http://developer.android.com/design/get-started/principles.html

Note: These changes will need to be migrated to Transifex to be
retained.
Improvements to documentation

Clarified some points, fixed typos etc.
Streamlined and improved comments in PHP example.
Disable excessive "no task enabled" notifications

Fixes https://github.com/ushahidi/SMSSync/issues/66
Merge pull request #72 from olliebennett/master

Improvements to documentation