added private constructor to AeroGearCrypto
improved Utils.checkSize
minor spelling corrections in README.md
removed unused import in CryptoBoxTest
improved Utils.newByteArray when passing null object
extracted activity class name in Util static block to constant
Unused variable
Inclusion of method to retrieve the SecretKey
Make spongycastle optional
changed NPE to IllegalArgumentException in Utils
Merge branch 'repairs'
Merge branch 'AGSEC-160'
Inclusion of HMAC and Base64 encoder support
Merge branch 'AGSEC-119'
updated doc to next snapshot and fixes some minor typos