Rename waiting_for_approval.text.html.erb to waiting_for_approval.html.erb

remove bad extention on filename for redmine 1.4.4
Rename project_has_been_approved.text.html.erb to project_has_been_approved.html.erb

remove bad extention on filename for redmine 1.4.4
Rename waiting_for_approval.text.plain.erb to waiting_for_approval.text.erb

remove bad extention on filename for redmine 1.4.4
Rename project_has_been_approved.text.plain.erb to project_has_been_approved.text.erb

remove bad extention on filename for redmine 1.4.4
Update project_approval.rb

Correct a little mistake with equal operator
Merge pull request #5 from macmonac/master

Compatibility with redmine 1.4.4 and path