updated version strings
updated changelog
updated version
reverted previous change...
typo fixes and formatting fix for contributing.md

git commands weren't being rendered correctly
update script usage testing docs

now that we don't have output files/dirs included under qiime_test_data/
Removed text referring to script that currently isn't merged into qiime
Merge pull request #1291 from gregcaporaso/180-dev

1.8.0-dev updates
Merge pull request #1294 from walterst/fix_rst_text_for_script_not_present

Removed text referring to script that currently isn't merged into qiime
Merge pull request #1293 from jrrideout/doc-fixes-post-1.8.0-release

Misc. documentation fixes