Allow display application parameters to be defined with allow_override="True". If parameter X is defined with allow_override="True", then if the dataset link contains the query parameter app_X="foo", the display parameter X will be set to foo regardless of the template text.
Fix sorting of numbers in scientific notation.

The -n option of sort can't handle numbers in scientific notation.
The -g option of sort can handle those numbers correctly.
Fix for the download_binary action type incorrectly processing downloaded compressed files.
Visualition framework: have 'has_dataprovider' test work on 'test_attr'
Visualization framework: add config files for built-in visualiztions
compile_templates.py: add option to save intermediate 'handlebars' files when compiling multiple template files
Merged in jmchilton/galaxy-central-display-application-parameters (pull request #99)

Display Application Parameter Enhancements
Merged in ghuls/galaxy-central/sort (pull request #172)

Fix sorting of numbers in scientific notation.
Bowtie2: Added quotation marks to group selection and added basic tool test