bugfix TDES::decrypt()
fix typo.
fix #1
Small fix

Missed a condition for commandline
fix #5 IDEA probrem
Merge pull request #2 from mugwort-rc/bugfix-tdes-decrypt

bugfix TDES::decrypt()
Merge pull request #3 from mugwort-rc/fix-typo

fix typo.
Merge pull request #4 from mugwort-rc/fix-issue1

fix #1 SHA512 probrem
Merge pull request #7 from mugwort-rc/fix-issue5

fix #5 IDEA probrem
Add unittest.
Add travis.yaml
Update .travis.yml
Update .travis.yml; libgmp-dev