Fix merge error
first pass on extends (still more todo - see all the todos at the end of file
Merge branch 'master' of https://github.com/less/less-docs
some re-wording as suggested by @seven.phases.max
Add some use-cases for extends
Updated mixins-recursive-loops.md
Updated mixins-recursive-loops.md
Updated mixins-recursive-loops.md
Merge pull request #38 from seven-phases-max/master

Tiny update for mixins-recursive-loops.md
Added file for Nested Rules
Add description of mixins with &
Add description of nested media queries.
Merge pull request #41 from tmccombs/nested

Add Documentation for Nested Rules.
getting started
re-organise, add some content and tidy up features
Merge branch 'master' of https://github.com/less/less-docs

Conflicts:
	content/features/mixins-recursive-loops.md
changes after latest merge
remove empty sections in variables
document mixins
moving more documentation from the old site to the new one