Added functions to convert hexadecimal bytestring to binary bytestring.
Merge conversion from hex to binary
Added RSA Signing tests
Fixed performance issue with haskell AES
Added functions to do signing and verification
Merge RSA signing.
cabal file added for haskell platform 2012.4.0.0
moving PARALLEL_BUILDS option to global for all builds
GHC_VERSION added to the build matrix where HASKELL_PLATFORM is given
commands to prepare the system, such as to install ghc & cabal as per environment variables
command to compile travis build script
new install section of travis YAML for installing dependencies and then raaz packages
new before_script section of travis YAML for configuring and building raaz packages
new script section of travis YAML to run test suites of raaz packages
added a few more sections to travis YAML to make tarball of packages and output final build messages
haskell script to be used to install, build and test raaz packages by travis
added fast_finish option to Tavis YAML
added a few comments to Travis YAML
new TravisEnv type added with some cleanup
refactoring of build code alongwith using TravisEnv type