Chanjo-report

Added
- A new gene overview for all or a subset of samples
- Include chanjo repo in Vagrant environment

Fixed
- roll back after `OperationalError`

Added
- handle post/get requests for the coverage report (URL limits)
- new "index" blueprint which displays list of samples and genes

Removed
- link to the "index" page from the report (security)

Changed
- use a customized version of the HTML form for the PDF link in the navbar
- avoid searching for group id if sample ids are submitted in query
- use "select" element for picking completeness level

Fixed
- removes the "submit" label from the customizations form
- look up "show_genes" from correct "args/form" dict

Fixed
- handle white-space in gene ids

Changed
- updates how to call diagnostic yield method to explicitly send in exon ids

Adds
- add ability to change sample/group id in report through query args