added docs about 0.5.3.
added docs about 0.5.3.

bmcculley/splinter,cobrateam/splinter,cobrateam/splinter,gjvis/splinter,objarni/splinter,drptbl/splinter,objarni/splinter,nikolas/splinter,objarni/splinter,underdogio/splinter,gjvis/splinter,drptbl/splinter,myself659/splinter,bmcculley/splinter,drptbl/splinter,bmcculley/splinter,gjvis/splinter,bubenkoff/splinter,nikolas/splinter,lrowe/splinter,bubenkoff/splinter,lrowe/splinter,myself659/splinter,nikolas/splinter,underdogio/splinter,cobrateam/splinter,underdogio/splinter,myself659/splinter,lrowe/splinter