Merge pull request #8 from Sionarch/master

Added Fritzing sketches. Updated arduino-led-wifi sketch to be consisten...
Updated documentation for release 0.7.0.
Updated examples documentation for 0.7.0 release.
Temporarily commented out download link to Evothings Client on Google Play.
Updated welcome page, new graphics and text, fixed checkbox layout.
Fixed spelling error.
Added release notes for 0.7.2.
main menu: "Evothings App" -> "Client".
EvoThingsDoc source link
Updated mobile-app page.
Changed EvoThings to Evothings in relevant places.
Updated Philips Hue example.
Play Store link.
Removed unused PNG. SVG replacement is available.
Simplified welcome screen.
Updated version number to 0.7.3
Updated sketch in Arduino LED On/Off TCP Example to include Ethernet Shield. Updated text accordingly.