delete redundancy cflags, make png working
add more options to build_png
refactor to use only one script file for each platform
change scripts to build for all libname and all arch type
make zlib luajit and curl working
make scripts more robust
add debug/release option
add debug release option to openssl
update document
improve document
Merge pull request #11 from andyque/testScripts

add build.sh to iOS platform