Change test_helper for CI.

Ref: https://github.com/colszowka/simplecov/issues/82
Update test code. (Prevent test_unit error)
Switch SimpleCov format in case using CI.
Add filter for SimpleeCov report.
Revert.
Add ignore setting.
Merge dev code for Redmine2.1.x (IssueID: #1112)
Add changelog and change version into 0.0.8. (IssueID: #1112)
Modify Rakefile for test.
Change to jQuery"s style. (IssueID: #1132)
Update gitignore.
Add GPL Lisence file.
Update rake file for rails 3.x

Caused ERROR: 'rake/rdoctask' is obsolete and no longer supported. Use 'rdoc/task' (available in RDoc 2.4.2+) instead.
Tests won't work

Searched for a redmine plugin with actual tests. Used this to determine
how to include fixtures again due to Engines::-Error. Worked so far.
Add test in case bad format start/end time are passed.
Force encoding on settings['banner_description'].  (IssueID: #1166)
Merge remote-tracking branch 'remotes/brianveltman/patch-1' into pr_27