add drill model, write specs and seeds
add dev plan navbar
add ability to select a drill and view its info
add exercise model
add indexes to invitation model
create assessment model
fix some issues
add drag'n'drop
add in place editing of repetitions
add form submition logic
move drills controller from coach scope
implement assessments creation
Merge pull request #11 from Minisai/R-16_Create_assessment_page

R-16: create assessment page