Revert "Add support to relative import path"

This reverts commit a53130b2a02d3f1c5176de7d15e1969b1a789dc8.

Conflicts:
	router_test.go
	testdata/fixture_relpath_test_ctrl.go

To only supports application in GOPATH
Replace import path from related to absolute

related commit 24e29691e936da1c8bb1f7802d650fbef8fc0d3d
Change the base path of create files by 'new' command from current directory to first path of GOPATH