WIP(): german docs
Merge branch 'canary' into docs-german
docs(guide): translates guide index to german
docs(guide): translates installation guide to german
docs(guide): translates conceptual overview to german
Merge branch 'canary' into docs-german
docs(guide): translates getting-started to german
docs(guide): translates using-translate-service to german
docs(guide): translates using-translate-filter to german
docs(guide): translates using-translate-directive to german
docs(guide/ru): partial loading

Russian translation support for the partial loading.
docs(guide): translates variable-replacement to german
Merge pull request #153 from DWand/ru-translation-partial-loading

Ru translation support: Partial loading
docs(guide): translates multi-language to german
docs(guide): translates storages guide to german
Merge branch 'docs-german' into canary
docs(guide): adds note for pluralization

adds note to embed corresponding locale file when
dealing with pluralization.

Closes #131
docs(guide): adds note for asynchronous loading

adds note about things to take care about when requesting
json for i18n data

Closes #138
docs(guide): translates custom-storages to german
chore(): updates angularjs dependency for travisCI's sake