[Issue #371] Opt out of inactive link styling when inactiveLinkAttributes is `nil` or empty.
[FIX] lineHeightMultiple is ignored.

The lineHeightMultiple is effectively ignored unless minimumLineHeight or maximumLineHeight are set for decreasing or increasing the line height respectively. This was introduced in an attempt to fix [Issue #314] (see [Commit #871b932]). The ternary operator applied the multiple to the wrong side of the result.
Merge pull request #373 from kevinoneill/master

[FIX] lineHeightMultiple is ignored.
Merge pull request #372 from JmeHsieh/master

Opt out of inactive link styling when inactiveLinkAttributes is `nil` or empty.
[Issue #372] Minor code reformatting
[Issue #372] Punching up documentation for active and inactive links