Backporting to beta (#4175)

* verification: check if server is running (#4140)

* verification: check if server is running

See also ethcore/email-verification#67c6466 and ethcore/sms-verification#a585e42.

* verification: show in the UI if server is running

* verification: code style ✨, more i18n

* fix i18n key

* Optimized hash lookups (#4144)

* Optimize hash comparison

* Use libc

* Ropsten fork detection (#4163)

* Stop flickering + added loader in AddressSelector (#4149)

* Stop UI flickering + added loader to AddressSelector #4103

* PR Grumbles

* Add a password strength component (#4153)

* Added new PasswordStrength Component

* Added tests

* PR Grumbles

* icarus -> update, increase web timeout. (#4165)

* icarus -> update, increase web timeout.

* Fix estimate gas

* Fix token images // Error in Contract Queries (#4169)

* Fix dapps not loading (#4170)

* Add secure to dappsreg

* Remove trailing slash // fix dapps