Merge pull request #164 from geertweening/develop

[FIX] return null for _getServer if there's no connected server
[DOC] update release notes
[TASK] bump version to 0.8.1-rc1
[TASK] add release candidate publish script
[TASK] update publish scripts
Revert "[FOLD] Add postinstall step to build the sjcl.js"

This reverts commit 42c853dbf49e70b64d672a531ca8cf2ae4e989b4.
[TASK] bump version to 0.8.1-rc2
[DOC] update README install instructions