LPhyBEAST v1.2.0

Require LPhy 1.6.0 or a higher version, and BEAST 2.7.7.

From version 1.2, LPhyBEASTExt is moved to here.

Significant changes:

• Change to setup IntelliJ as Maven project #140
• Update BEAST dependencies to 2.7.7 #148

Bug fix and new feature:

• It should exclude Value's type not the Value itself #135
• use getExcludedGenerator first #136
• Model misspecification test #137
• Add UpDownOperator to PopulationFunction #139
• LocalClockToBeast dependency setting #145
• Merge LPhyBeast-Ext to this repo #147