Oeps, bump version in el file
Fix issue #42 "Android-mode compile Error" again.
Bump version to 0.3.3
Make "C-c a" the default `android-mode-key-prefix'

The former "C-c C-c" interferes with other modes like magit.

Fixes GH#38.
Honor ANDROID_HOME environment variable

Setting the default value of `defcustom` to some `getenv` value does not
work as expected.
Drop default for `android-mode-sdk-dir'

Yield an error when SDK directory can't be determined.
Bump version to 0.4.0