v2.1.3

Merge pull request #173 from Caleydo/release_2.1.3

Release 2.1.3

v2.1.2: Merge pull request #170 from Caleydo/release_2.1.2

Release 2.1.2

v2.1.1: Merge pull request #149 from Caleydo/release_2.1.1

prepare release_2.1.1

v2.1.0

highlights

• new session management
• hundreds of bugfixes
• improved ui