minor updates to fix errors

this script could use a major refactoring (e.g., the monster try/except block is scary)
fixed typo
Merge branch 'make_qiime_rst_file-updates' of github.com:gregcaporaso/qiime into make_qiime_rst_file-updates

Conflicts:
	scripts/make_qiime_rst_file.py
Merge pull request #569 from gregcaporaso/make_qiime_rst_file-updates

Make qiime rst file updates
Updated install docs to reference current dep versions; updated pynast urls; added gdata test to print_qiime_config.py.
Merge pull request #572 from jrrideout/pynast_links

Updated install docs to reference current dep versions; updated pynast u...
Updated the library and tests with the discussed changes.
Modified the results writing component of the compare_alpha_diversity.py script so that it correctly writes the reduced results.
Modified the documentation of the script to update to the new way of doing multiple comparison correction etc.
Modified the documentation as suggested by Jens.
Merge pull request #523 from wdwvt1/alpha_diversity_changes

Alpha diversity changes
re-organized the layout of the QIIME tutorials

we've got a lot of them now, so makes sense to break them apart a little bit. i'd really like to have a catch-all glob under "Other", but putting a glob in there gets all of the pages since I the layout involves multiple :toc:s. I could figure out how to add subheadings in the :toc:s,which would likely be a better solution.
Made the requested changes to the documentation and multiple comparison correction.
expanded description
Modified to avoid error Jai pointed out.
Merge pull request #573 from gregcaporaso/tutorial-organization

Tutorial organization
Merge pull request #515 from wdwvt1/compare_alpha_diversity.py

Compare alpha diversity.py
updates to ChangeLog for 1.6.0
renaming to display on GitHub page
adding md formatting for 1.6.0 changes