onClick prop called prior to setting location (e.g. for analytics tracking)

• Add @charlesbdudley as a contributor c310df1
• Merge pull request #33 from charlesbdudley/master 6fb4b74
• Added onClick prop and updated tests 4b00e52
• 3.1.1 64a3c30
• 3.1.2 a72c050
• Simplify demo 84730e8

v3.1.1...v3.2.0