Starfield fix and Milky Way

Fixed bug where more stars were generated at the poles.

Added 'Milky Way' band in sky, customisable with MILKY_WAY_WIDTH,
MILKY_WAY_INCLINATION and MILKY_WAY_RATIO consts in Generator.cpp.
Merge pull request #1142 from lordwaym/starfield-fix

Starfield fix and Milky Way
update to latest civetweb from source
create a copy of document root string
Merge pull request #1155 from birarda/assignment

update to latest civetweb from source
don't delete last scripted assignment before it is sent out
Merge pull request #1156 from birarda/assignment

fix scripted assignment delete before it is sent out
fix the dialog mouselook bug
Merge pull request #1157 from birarda/assignment

finally fix the dialog mouselook bug
Merge branch 'master' of https://github.com/worklist/hifi into bugfixes