Stratum up (#4233)

* flush work

* flush work

* flush work

* flush work

* generalized notifiers

* general setup with modules

* general setup with modules

* all binded

* catch up with master

* all dependencies injected

* stratum another up

* tcp update

* submitwork routine

* finalize & fix warnings

* merge bugs, review fixes

* merge bugs, review fixes

* new cli mess cleanup

* usage.txt swap

* flush work

* cli adopt

* compilation with new cli sorted

* subid space in json

* serialization issues

* grumbles addressed

* more grumbles

* remove last_work note for now

* fix compilation

* fix tests

* merge bugs

* no obliged ipc

* moving notifiers

* no optional feature now

* refactored again

* working on tests

* refactor to new tcp/ip

* stratum lib ok

* ethcore crate ok

* wip on tests

* final test working

* fix warnings, \n-terminated response

* new compatibility

* re-pushing work once anybody submitted

* various review and general fixes

* reviewe fixes

* remove redundant notifier

* one symbol -> huge bug

* ensure write lock isn't held when calling handlers

* extern declarations moved

* options to stratum mod, SocketAddr strongly-typed instantiation

* Minor style fix.

* Whitespace and phrasing

* Whitespace