Remove TOOD item for overloading support
Remove error system TODO entry
Remove mention of overloading in todo test list
update to new helpers location
we aren't limited to the perl versions travis provides
fix mistake in travis config
list all runtime and configure prerequisites as authordeps

Part of Moose's documentation is built by introspecting the classes.
This means we need to be able to build and run Moose itself for a dzil
build to succeed.  This hasn't been a problem until now, because we
already have Moose installed as a prerequisite of Dist::Zilla.  But when
we add prereqs, the installed prereqs aren't enough.
Merge pull request #86 from moose/topic/all-deps-as-author

list all runtime and configure prerequisites as authordeps
affirm at the end of the build that everything is declared as an authordep that should be

See PR#86 -- for now, at least, we need to ensure that runtime prereqs are
extractable without performing a full 'dzil build', so travis can get
everything set up in advance (because the newly-built Moose is run as part of
the build, if we perform the build to get the prereqs we have already lost).
pass no_refs option to Devel::StackTrace, in anticipation of a future version supporting this
bump version to 2.1400, with token changelog entry