Merge pull request #725 from bhariharan/unstable

Remove SyncBasicHttpParams from httpcore
Reverting test fix
More path fixes, making ANDROID_HOME prereq
Specifically targeting 'android' tool from the Android SDK
Adding Windows android path, reverting plugin path
Don't need volatile_unstable plugin.

Android doesn't use binaries in the plugin.  The main unstable branch will suffice.
Merge pull request #726 from khawkins/fix_windows

Adding agnostic paths to npm package, checking for Android SDK
First round of CacheManager refactoring