fixed a JSP tag error

Eclipse can't handle tag files that reference scoped attributes, though
JSP can.  This commit defines a parameter for passing the contextPath to
a couple of tags that need it, rather than directly obtaining it from
pageContext.request.contextPath.
adjusted names to be consistent with convention
implemented unit test for CommandSupportedFixtureService.removeFixture
fixed a checkstyle warning
implemented CommandSupportedFixtureService.removeFixture
added FixtureService.findFixtureById
removed unused imports
changed signature of FixtureService.removeFixture

The ID is really all that's needed.
added RemovalController and associated unit tests
added standard file header to our javascript files
Merge remote-tracking branch 'origin/master' into AFDP-51
pass the fixture id to the row controls
bind modal-trigger events further up the DOM
removal controller needs to present a model with "success=true"
set the control-function attribute to indicate add
introduced control strategies for fixtures view controller
delegate to control function strategies in FixturesViewController
initial stab a remove dialog content

This is really just a copy of the content for the enrollment dialog;
needs significant modification to serve in the remove case
minor whitespace improvement
FixtureService.removeFixture now returns a partial model

It's more convenient to get the fixture ID from the response body, so we
now return a fixture model with nothing but the ID in it.