v0.6.0

Changed

• schema.Distribution now supports "lognormal" with sample mean and std along with "gamma" (shape, scale)
• engine.CiwConverter updated to handle ciw lognormal and gamma distributions. Lognormal parameters converted to mu and sigma of underlying normal.

Fixed

• Included missing distribution type in json2ciw app sidebar.
• Service distribution now displays mean parameter for the exponential distribution.