Merge pull request #50 from DavidVorick/rsc

Add Reed-Solomon Coding
clean up slice handling code
Merge pull request #52 from DavidVorick/cleanup

Cleanup
Added repo libsodium
Add createKeyPair() for signing, with a basic test
update submodules upon make
remove absolute path from erasure.go, clean up makefile
Merge pull request #54 from DavidVorick/crypto

Crypto
Merge pull request #55 from DavidVorick/makefileHotfix

Makefile hotfix
added a 'todo' file to the git ignore, for convenience
travis ci should be able to use <sodium.h> now
Merge pull request #56 from DavidVorick/crypto

Fix travis ci for libsodium
Merge branch 'master' into newstate