Adjusted XSSLManager structure

[git-p4: depot-paths = "//xFace-Apollo/branches/openxface-android/": change = 17250]
Modified param of calculate MD5 function from char[] to byte[] in XCryptor.

[git-p4: depot-paths = "//xFace-Apollo/branches/openxface-android/": change = 17251]
Added an assets file utility class.

[git-p4: depot-paths = "//xFace-Apollo/branches/openxface-android/": change = 17252]