Also:
- Remove unnecessary space from `figure` tag if no class is specified.
- Update related tests.
- Add test cases for the changes made to the figure shortcode.
- Document the newly added target and rel parameters
- Add more detail to the documentation of all figure shortcode parameters.
toml v0.3.0 was released in March 2017 and is missing few fixes made in toml
package after the fact. So use the master branch instead.
This fixes a regression when switch was made from govendor vendor.json dep
management to Go dep.
Fixes#3998