More commands: ping, nslookup, ctags...

Release 1.2 of the ios_system libraries.

Contains a precompiled version of all the libraries and frameworks associated with ios_system:

• https://github.com/holzschu/ios_system
• https://github.com/holzschu/lib-tex
• https://github.com/holzschu/ctags
• https://github.com/holzschu/python_ios
• https://github.com/holzschu/network_ios
• https://github.com/holzschu/lua_ios

Compared to v1.1:

• commands now return the proper error code.
• ios_system handles files with spaces in their names (provided the spaces are escaped (new\ file) or the filename is enclosed within quotes ("new file"). Backslashes have to be escaped.
• fixed a bug where the "awk" command had disappeared.
• added commands: ctags, nslookup, ping, dig, host.

As before, 2 versions of pre-compiled binaries available:

• release = iOS_system.framework and all the associated libraries. Useful when you're building an application, like shell, ivim...
• smallRelease = ios_system.framework + openssl.framework + libssh2.framework. Useful when you need to compile a new library.