Minor fix Travis-ci badge URL
Fix 'pre.beta.4' to 'beta.5' Bundler upgrade impossible

This gem used to follow the semantic versionning recommendations,
however, Bundler causes issues when non-alphanumeric characters are
present in the version number (e.g. 1.0.0-beta.4) which make
installing the gem from Github a pain.

That's why I switched to the versionning scheme used by Bundler.
Were '1.0.0-beta.4' was interpreted by Bundler as '1.0.0.pre.beta.4',
'1.0.0.beta.5' is interpreted as '1.0.0.beta.5' (no issue) and,
as 'b' comes before 'p' in the alphabet, is considered as lesser
than '1.0.0.pre.4' (that's an issue).

As a workaround, I'll continue to use the Bundler-friendly version
numbering, and did bump the current version number to '1.0.0.pre.5'.

See http://semver.org and http://rubygems.org/gems/bundler/versions

Fixes #10
Update the gem versions in the dummy app

(Simply run `cd test/dummy && rspec` to do that.)
Merge branch 'fix-version-number-migration-from-semver'