LRDOCS-580 Alloy UI build instructions
Introduce Alloy UI's sandbox
Alloy UI - Start introduction
Alloy UI - intro - clarify points per Nate's comments
Remove trailing spaces
No whitespace between 'Alloy' and 'UI'
Remove unnecessary extra code
Add info about YUI.use() callback
TODO - Add screenshot of Liferay IDE's Design view
Remove unnecessary extra code
Typo fix
Add info about using AUI from CDN
Merge branch 'alloy-intro' of https://github.com/zenorocha/liferay-docs into alloy-intro

Conflicts:
	devGuide/en/chapters/11-alloy-ui.markdown
AlloyUI - Filled out introduction. Added headers for the chapter's sections.
Fix the main AlloyUI example
Alloy UI intro - Focus on YUI's benefits as a base framework in second paragraph. Wordsmith other paragraphs.
AlloyUI intro - Move jQuery sidenote beneath the YUI benefits paragraph.
AlloyUI intro - Open up with a crutch paragraph.
AlloyUI intro - Explain goals of this chapter. Refer readers to official AlloyUI project site for latest details.
AlloyUI - Edited the installation and build instructions.