Add typeahead for exercises names

Create a ember view extending the default textfield view from ember
with typeahead included and uses it to give sugestions of commons
names during the creation of an exercise.
Boost the typeahead selector
Add typeahead exercise full completion

Now when a exercise is selected in the typeahead, all the avaliable
fields from the retrived exercise are uset to complete the actual
exercise.
Merge branch 'master' of github.com:AEHO/traintool