v0.7.6

Summer stability! This is the first stable release of the v0.7.* series. The
current plan is to let v0.7.* be the main release series for the next several
months, letting downstream projects use it more or less as-is for a while... and
offer feedback, if they are so inspired, to help drive the next major round of
development.

Breaking changes:

• None.

Other notable changes:

• net-util:
  • Minor fixes to hostname / IP address parsing.
• webapp-core:
  • Exported NetworkHost, which was supposed to have been public since day
    one.
• testing:
  • Added more unit tests.
  • Fixed a handful of bugs that cropped up from the effort (all minor).