• Ask user to install platform (when it hasn't been installed yet) within
  platformio run and platformio show commands
• Improved main documentation
• Fixed "OSError: [Errno 2] No such file or directory" within
  platformio run
  command when PlatformIO isn't installed properly
• Fixed example for Eclipse IDE with Tiva board
  (issue #32)
• Upgraded Eclipse Project Examples
  to latest Luna and PlatformIO releases