NR-57 : Basic REST server components for handling gateway

fix css
Merge branch '56-design-and-implement-the-security-plugin-API' of dev.sourcefabric.org:ally-py into 56-design-and-implement-the-security-plugin-API
Merge branch '56-design-and-implement-the-security-plugin-API' of dev.sourcefabric.org:ally-py into 56-design-and-implement-the-security-plugin-API
Merge branch '56-design-and-implement-the-security-plugin-API' of dev.sourcefabric.org:ally-py into 56-design-and-implement-the-security-plugin-API
Merge branch '56-design-and-implement-the-security-plugin-API' of dev.sourcefabric.org:ally-py into 56-design-and-implement-the-security-plugin-API
Merge branch '56-design-and-implement-the-security-plugin-API' of dev.sourcefabric.org:ally-py into 56-design-and-implement-the-security-plugin-API
Merge branch '56-design-and-implement-the-security-plugin-API' of dev.sourcefabric.org:ally-py into 56-design-and-implement-the-security-plugin-API
Merge branch '56-design-and-implement-the-security-plugin-API' of dev.sourcefabric.org:ally-py into 56-design-and-implement-the-security-plugin-API
NR-56 : Design and implement the security plugin API

partial ui