update add_alpha_to_mapping_file.py to address #969
update virtual box docs to address #969
update otu_category_significance.rst to address #969
update core_diversity_analysis.rst to address #969
updated to use QIIME's temp_dir
Merge pull request #1199 from gregcaporaso/issue-1114

updated to use QIIME's temp_dir
reverting previous changes
Merge pull request #1200 from casaburi/issue-969

Issue 969