ARROW-3431: [GLib] Include Gemfile to archive
ARROW-3431: [GLib] Include Gemfile to archive

It's helpful to setup test environment.

Author: Kouhei Sutou <kou@clear-code.com>

Closes #2702 from kou/c-glib-add-missing-gemfile-to-archive and squashes the following commits:

5c97dad1b <Kouhei Sutou>  Include Gemfile to archive

wesm/arrow,wesm/arrow,majetideepak/arrow,majetideepak/arrow,icexelloss/arrow,pcmoritz/arrow,wesm/arrow,pcmoritz/arrow,xhochy/arrow,laurentgo/arrow,itaiin/arrow,majetideepak/arrow,renesugar/arrow,wesm/arrow,cpcloud/arrow,kou/arrow,apache/arrow,xhochy/arrow,wesm/arrow,apache/arrow,laurentgo/arrow,laurentgo/arrow,pcmoritz/arrow,wesm/arrow,kou/arrow,icexelloss/arrow,tebeka/arrow,laurentgo/arrow,tebeka/arrow,icexelloss/arrow,icexelloss/arrow,apache/arrow,pcmoritz/arrow,renesugar/arrow,xhochy/arrow,icexelloss/arrow,itaiin/arrow,kou/arrow,itaiin/arrow,wesm/arrow,tebeka/arrow,apache/arrow,tebeka/arrow,icexelloss/arrow,kou/arrow,wesm/arrow,xhochy/arrow,wesm/arrow,renesugar/arrow,itaiin/arrow,cpcloud/arrow,icexelloss/arrow,apache/arrow,pcmoritz/arrow,xhochy/arrow,wesm/arrow,renesugar/arrow,icexelloss/arrow,itaiin/arrow,majetideepak/arrow,apache/arrow,pcmoritz/arrow,kou/arrow,kou/arrow,itaiin/arrow,laurentgo/arrow,majetideepak/arrow,tebeka/arrow,tebeka/arrow,itaiin/arrow,majetideepak/arrow,pcmoritz/arrow,renesugar/arrow,pcmoritz/arrow,cpcloud/arrow,cpcloud/arrow,icexelloss/arrow,pcmoritz/arrow,kou/arrow,pcmoritz/arrow,itaiin/arrow,majetideepak/arrow,xhochy/arrow,itaiin/arrow,cpcloud/arrow,pcmoritz/arrow,pcmoritz/arrow,xhochy/arrow,kou/arrow,apache/arrow,icexelloss/arrow,wesm/arrow,apache/arrow,itaiin/arrow,cpcloud/arrow,cpcloud/arrow,icexelloss/arrow,xhochy/arrow,cpcloud/arrow,renesugar/arrow,wesm/arrow,laurentgo/arrow,tebeka/arrow,kou/arrow,laurentgo/arrow,itaiin/arrow,renesugar/arrow,apache/arrow,apache/arrow,kou/arrow,cpcloud/arrow,majetideepak/arrow,renesugar/arrow,majetideepak/arrow,apache/arrow,kou/arrow,laurentgo/arrow,xhochy/arrow,majetideepak/arrow,apache/arrow,itaiin/arrow,laurentgo/arrow,xhochy/arrow,renesugar/arrow,renesugar/arrow,kou/arrow,wesm/arrow,pcmoritz/arrow,majetideepak/arrow,itaiin/arrow,xhochy/arrow,laurentgo/arrow,laurentgo/arrow,cpcloud/arrow,pcmoritz/arrow,laurentgo/arrow,majetideepak/arrow,cpcloud/arrow,majetideepak/arrow,xhochy/arrow,xhochy/arrow,tebeka/arrow,majetideepak/arrow,wesm/arrow,icexelloss/arrow,kou/arrow,cpcloud/arrow,tebeka/arrow,icexelloss/arrow,laurentgo/arrow,tebeka/arrow,apache/arrow,renesugar/arrow,kou/arrow,laurentgo/arrow,xhochy/arrow,itaiin/arrow,cpcloud/arrow,renesugar/arrow,pcmoritz/arrow,renesugar/arrow,majetideepak/arrow,renesugar/arrow,laurentgo/arrow,apache/arrow,renesugar/arrow,itaiin/arrow,cpcloud/arrow,xhochy/arrow,icexelloss/arrow