Created README.rst (based off of ubidots-python/README.rst), README_dev (for developers), ANT build file, .gitignore

* Created README.rst
 +  Based off the python's library's README.rst, gives a quickstart for using the java library.
* README_dev
  + Describes the build system and provides information about how dependencies are handled.
* ANT build file
  + Build file allowing building and creating a jar from the command line.
* .gitignore
   + Git ignore file to prevent tracked of binary files and Emacs junk files.