Merge v1.6.0 release candidate branch '1.6.0-rc1'

Merge pull request #1541 from cyclus/v1.5.5-release

V1.5.5 release: Changelog Updates

Merge pull request #1521 from bam241/changelog_1.5.4

Update changelog for 1.5.4 release

Updated CHANGELOG for 1.5.3

Updated CHANGELOG for 1.5.2

update package in dockerfile for deb package

Cyclus project release 1.5.0, see http://fuelcycle.org/previous/v1.5.…

…0.html for release notes

Merge pull request #1316 from Baaaaam/fix_smbch

Fix smbch

Merge pull request #1317 from Baaaaam/abi_fix

I don't understand why... Abi fix

Merge pull request #1313 from scopatz/deps

merging!
thx @scopatz