fixes for #77, #74, #75, #76, #72, #70

• added support for 64 bit mac version
• added support for node-webkit 0.10 and higher
• added support to specify version of node-webkit
• fix issues #40, #45, #46, #48, #51

• fix #41

• updated wiki: https://github.com/Dica-Developer/generator-node-webkit/wiki
• wrote tests
• fixed issues: #17, #18, #22, #24, #25, #26, #29, #33, #34