Some plugin generation fixes.

- Ensure empty lines in some places
- Only print the table if we actually have items to put in there
- Always use inspect function when printing out the defaults

Fixes #2045
Update templates

- Fix empty lines
- Add some more text

Fixes #2045
Modify static docs to work with Generated plugin docs

Fixes #2067
Fix for missing type links in generated docs

Fixes #2068
Fix after @electrical changes

Fixes #2068
Include 99 plugins by default.

This plugin set should be the same as the ones included in "core" in
Logstash 1.4.2, so users should experience no negative impact of this.

Fixes #2020
Modify the way we fetch the installed version of the plugin

Fixes #2025

Fixes #2063
Use detect call to simplify it after review

Fixes #2063