Sample app documentation edits.
Update README.md
MODIFY Remove local project config string

OPENTOK-16287
Merge pull request #28 from wobbals/OPENTOK-16287

MODIFY Remove local project config string
rollback to 2.2 SDK support
Merge pull request #31 from bsrao/rollback-to-2.2

rollback to 2.2 SDK support
Sample app documentation edits.