Renamed all jemc_c-example names to jemc_cexample; '-' causes conflict with C

--HG--
rename : ext/jemc_c-example/extconf.rb => ext/jemc_cexample/extconf.rb
rename : ext/jemc_c-example/jemc_c-example.c => ext/jemc_cexample/jemc_cexample.c
rename : jemc_c-example.gemspec => jemc_cexample.gemspec