fix init-store can't find main class

change travise releases order to prevent tar from containning
the source jar package.

fix apache#245
Change-Id: Ibc343ce22b4fbad2d0e078975fa8f2dc86f0f430

HugeGraph-1358: Release 0.7.4

Change-Id: I145d8bb3ce96fb125ef81fa0fa5098654319acee

HugeGraph-1388: Unified the way to get free memory on linux system

Change-Id: I4e4ca50387abc25f26cd85c247060b80497e85d3