Modified -d option and fixed bugs
The problem is, if the string includes mixture of
encrypted string and Unecrypted string, it will throw an error
because some non-hexadecimal string will go into decrypting function.
So I provided a solution to that problem
Merge remote-tracking branch 'upstream/master'
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Merge remote-tracking branch 'upstream/master'

Conflicts:
	wordcrypt.py
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saving change
reorganized
Fixed bug in lines where args.string is not none
There was some confusion in writing loops
Encryption with particular string works well now
Merge branch 'master' of https://github.com/hyunmoon/wordcrypt

Conflicts:
	wordcrypt.py
edited spaces