v2.0.0-rc2

• Adds before callback option that was missing from 2.0.0-rc1.
• Fixes Invalid State Error bug in Internet Explorer. Thanks @awoodford.
• Hashtags are now parsed from the image caption, and made available as a tags array on the image data.
• Changed default timeout options apiTimeout and accessTokenTimeout from 5000 (5 seconds) to 10000 (10 seconds)