Add instructions for travis-ci to README
Add instructions for travis-ci to README

astropy/photutils,pulsestaysconstant/ccdproc,vterron/montage-wrapper,ceb8/astroquery,alexrudy/Zeeko,astrofrog/montage-wrapper,astropy/montage-wrapper,imbasimba/astroquery,adamginsburg/APEX_CMZ_H2CO,indiajoe/ccdproc,cdeil/naima,astropy/ccdproc,cdeil/naima,keflavich/APEX_CMZ_H2CO,mwcraig/aplpy,zblz/naima,adamginsburg/APEX_CMZ_H2CO,ceb8/astroquery,jat255/montage-wrapper,astrofrog/montage-wrapper,alexrudy/Zeeko,larrybradley/photutils,allisony/aplpy,mwcraig/ccdproc,evertrol/ccdproc,crawfordsm/ccdproc,keflavich/APEX_CMZ_H2CO,imbasimba/astroquery