v0.3.0

DocumenterInterLinks v0.3.0

Diff since v0.2.5

Merged pull requests:

• Remove inventory writing code (#2) (@goerz)
• Add ExternalFallbacks plugin (#3) (@goerz)
• Do not require backticks for short-circuit (#4) (@goerz)
• Implement automatic fallback (#5) (@goerz)