Versions must contain only numbers and periods.

[udalrich]

Required-Packages must have a version. Force compiler to use 1.5 source

I was unable to get the code to compile as it was, due to several issues.

• Cask requires a version in Packag-Requires header
• Cask requires that the version is a number, followed by numbers and dots. The -SNAPSHOT is not allowed.
• Some of the nrepl-* function have been renamed to cider-*. Some have aliases and are marked as obsolete, but others are just missing.
• I fixed a warning about the expected name of the plugin not matching the expected value.
• The compiler was treating it as 1.3 source, so I added a plugin setting to treat it as 1.5, the minimum for annotations.