Set HTTPI logger to Savon logger
Add spec for option logger to be set in HTTPI
Merge pull request #636 from krissi/set_httpi_logger

Set HTTPI logger to Savon logger
Loosen versions of dependencies

It has been rather annoying and cumbersome to update these as
new patch versions of gyoku, wasabi, etc are released. My feeling
is that limiting them to the minor version number is fine (because
we might want to verify that a feature exists, for example). This means
that we only need to change this when the minor version changes
Lock Wasabi down to 3.3.0

Seems contradictory, given that I just loosened up the dependencies for
everything else, but the tests are currently failing against Wasabi 3.3.1

Seems that the fixes for Wasabi issue 46 broke operation names. Will need to
revisit that.
Bump HTTPI to v2.3

Gotta get those SSL versions, yo
Bump version to 2.8

Relevant to #639 and #623
Remove rubinius from the travis matrix

Seeing all kinds of terrible corrupted cached gems on Travis for
rubinius. In general, I'd like to support rubinius, but running it on
travis is just too much of a pain.
Update Savon version on README.md
Merge pull request #649 from mparramont/patch-1

Update Savon version on README.md