Spell fixes for expanded functions-modules
Transfered expanded function-definition exposition
Added example multi-line indented block
Spelling and markup
More code markup
typographic fixes
renamed expanded funcitonsandmodules, removed duplicated files
Corrected name
Merge branch 'gh-pages' into thw-indentedcblock

Conflicts:
	lessons/thw-python/flow-control/python_flow_control.ipynb
	lessons/thw-python/vars-types/variables.ipynb
Merge pull request #109 from wltrimbl/functiondef

Harmonized expanded thw-functions modules
Merge gh-pages into wltrimbl-thw-indentedcblock
merging in gh-pages
Stand-alone lesson on plyr
Typos
New example for modeling across sites
Added an intro, expectations and some more examples
Addressing @jdbilshack comments in issue/91
Hard wraps and wrapped long code lines
Changes suggested by @jdblischak
Merge branch 'wking2/stand-alone-plyr-lesson'

This brings in the content from
https://github.com/swcarpentry/bc/pull/91

Thanks to @wking and @jduckles for their work on this.