Merge pull request #3 from titoBouzout/master

Add entity decode/encode
Fix base64-decoding of non-ASCII text
Merge pull request #4 from earshinov/master

Fix base64-decoding of non-ASCII text
Fixed MD5, Base64, SHA1 encoding with UTF-8 strings
#5 - automatically pad Base64 encoded text to 4 characters with = to be able to decode it
updated readme