remove unused scrypt lib, we'll implement it later

Revert "include scrypt library in source tree (temporarily)"

This reverts commit 81e13040928eb00e012c805fb504c7a3f3ecd51e.

Conflicts:
	cachewordlib/src/com/lambdaworks/crypto/SCryptUtil.java
allow for foregrounding and backgrounding the CacheWord service

backgrounding is the default
build notifications using the support lib for backwards compat
docs and implementation comments