normalize line endings
Revert "normalize line endings"

This reverts commit 8b2143a21aa602d98f83fd9386ea7f029bd1d3a6.
chnage to \n
added main to 4.5 grouping content
removed 'main content' from common idioms

section is no longer relevant
removed contradiction in Link type "license"

it stated that the spec does not provide a means to specify main
content. also it advised to use styling to indicate license scope, (bad
for accessibility) changed advice to provide scope info in text.
added main to The "in body" insertion mode
added main to bidirectional style rule
not(main) added to 10.3.5 Bidirectional text
added main to WAI-ARIA section

added main to strong semantics table as per other new HTML5 structural
elements.
modified body element definition

removed the word "main" from defintion of the body element as the main
content of a document is identified using the <main> element.
added main to element lists

added main to element, category and interface lists
user agent advice on keyboard nav to main

also shortened so long lines
added main element to section examples

section '4.4 Sections' contains some code examples where it is
appropriate to use the main element, so added them.
http://www.w3.org/html/wg/drafts/html/master/sections.html#sections
Merge pull request #5 from stevefaulkner/main-element

Main element