Merge tag '0.2.3' into develop

extend custom legend; add requireJS support
Support for strict dependency injection and CommonJs loading
extend package.json
Merge branch 'patch-1' of github.com:myagoo/angular-chart into myagoo-patch-1
add more require cases and improve coverage
remove npm dependencies again
update to c3 v0.4.x
update dev dependencies
add dynamic dataset watchers
watch for changes inside the dataset object as long as no more than 100 records are present, than change to watch only the number of records and not for changes in every record. Can be configured throw options.data.watchLimit; Fix #28
add npm dependencies
add version number 0.2.4
Merge branch 'release/0.2.4'