Merge pull request #275 from bhariharan/unstable20

Fix for NPE
Fixed links to external/shared -- hybrid sample apps tests all passing
New hybrid sample app: AccountEditor
Merge from unstable20
Account editor now working inside container
Pointing to latest external/shared
Now pointing external/shared to forcedotcom/SalesforceMobileSDK-Shared branch:unstable20
Fixing copyright
Small changes in README.md
Merge branch 'entity_proto' of github.com:wmathurin/SalesforceMobileSDK-Android into entity_proto
Merge pull request #279 from wmathurin/entity_proto

AccountEditor sample app (+ links fixes for shared reorg)
Pointing to latest external/shared
Merge pull request #280 from wmathurin/unstable20

Pointing to latest external/shared
Pointing to latest external/shared
Merge pull request #281 from wmathurin/unstable20

Pointing to latest external/shared
Changing version to 2.0.0unstable
Merge pull request #282 from khawkins/version_update

Changing version to 2.0.0unstable
Make ForceApp a singleton class not extending from Application and refactoring all over
Merge branch 'unstable20' into sdk_componentization
Make ForceAppWithSmartStore a standalone class and more refactoring