Fix some clang warnings
Fix stale pointer issue in RBinELF. Add r_mem_dup
Refactor the new io-read-api (disabled by default)
Color in main help!
a few cleanups in bin and lang

* libr/bin/bin.c: remove duplicate condition (xtr && xtr)
* libr/bin/p/bin_elf.c!libs: use r_list_newf
* libr/lang/p/Makefile: add empty "clean" target to silence make warning
travis: split tests to multiple jobs / fail only on regressions