v0.2.0

• Improvements to handling external R dependency (#57 by @ethanwhite)
• Add installation instructions (#58 by @abhidg)
• Remove unused dependencies (#57 by @ethanwhite, #59 by @abhidg)
• Fix R downloads (#64 by @ethanwhite, 74255ae by @garezana)
• Better exception handling (#67 by @garezana)
• Start a test suite (#68 & #69 by @ethanwhite and @garezana)
• Add Library Carpentry lessons (#71 by @ethanwhite)
• Fix miniCRAN installation (#70 by @ethanwhite)