Merge pull request #65 from bhariharan/unstable20

Merge branch 'unstable' into unstable20
Load cordova.exec before using it
Merge pull request #67 from bhariharan/master

Call require on cordova/exec before using it
Merge branch 'master' into unstable
Merge pull request #68 from bhariharan/unstable

Merge 'master' into unstable
Merge branch 'unstable' into unstable20