add easyconfig Bison-3.0.4-foss-2016a.eb, add easyconfig...

add easyconfig Bison-3.0.4-foss-2016a.eb, add easyconfig M4-1.4.17-foss-2016a.eb, add easyconfig flex-2.5.39-foss-2016a.eb, add easyconfig flex-2.6.0-foss-2016a.eb