0.3.0 (6-6-2016)

* de023d7 vm: print error if opening file failed
* 2bb7372 os: add os.urandom
* 67b330d vm: don't support mod/index.jsdll construct
* bd4384a vm: fix require if directory and js file exist but dir is not usable
* a1eca61 objectutil: remove _extend
* e149381 net: remove unneeded value conversion
* 49e1a35 misc: simplified statements
* 3210a41 misc: use Object.assign to avoid modifying given parameters
* 0252f29 net: improved parameter validation
* e20a6af os: remove old comment
* 1cc8971 os: use arc4random_buf on OSX for os.urandom
* c08c965 build: add CFLAGS to CMAKE_C_FLAGS
* d889fe3 modules: add random module
* 916cb9c os: validate fd when opening /dev/urandom
* 5e77925 core: open all file descriptors with O_CLOEXEC
* 2d1612d os: fix spacing
* a261cb8 os: add os.fork, os.execve and related functions
* db28c76 net: use os.nonblock
* 0a75845 net: fix storing the non-blocking flag on the instance
* 78fedc1 doc: mention that O_CLOEXEC is now the default
* d912f97 os: add os.getpid and os.getppid
* d2e3d2a io: add missing io.fdopen
* d45e7ec vm: fix freeing memory on file read error
* ce710cb vm: error early if trying to read a directory
* ff53204 io: add readline function
* 7374519 os: add os.dup and os.dup2
* 489f2ff doc: fix typos
* 05cbc66 doc: add some section titles
* 009a4c2 os: add os.chdir
* 020f2c5 misc: add documentation and build status to README
* 01b392e io: fix typo
* b460709 os: refactor os.close
* dbf713b os: add os._exit
* b492288 os,system: move exit() to os module
* ebd634b modules: make system a non-builtin module
* a17b345 os: add os.setsid
* bb01c1d modules: add process module
* 7d12970 misc: new logo
* 015df52 random: remove unneeded cast
* 567f56c build,cli: fix compilation iwarning on ARM
* 1b75cb7 cli: update linenoise
* 201926f cli: use lineoise allocator function to free result
* e19211d cli: rename file
* 375f9a0 cli: remove duplicated includes
* a22fe9a test: add another execve test
* a7e8aef os: add os.execv
* d2176d2 doc: improve docs on os.execv/e
* 175dd08 io: add support for unbuffered stdio
* 3d8007c io: don't expose File objects, factory functions must be used
* 14e74a0 os: add execvp/e
* 1e949fe process: add process.spawn
* 4405aa8 os: add os.get{u,eu,g,eg}id
* 5a53aaf modules: add pwd module
* b1f5e08 os: add os.setuid and os.setgid
* 3ec5c09 os: add os.{get,set}groups
* e3d82e8 os: simplify exporting functions
* 83a2dd0 os: add STD{IN,OUT,ERR}_FILENO constants
* 02d6eb0 modules: add uuid module
* bc19d76 cli: use EXIT_SUCCESS and EXIT_FAILURE when exiting
* 1bc6cbe test: properly cleanup resources
* 8351eee doc: add process.spawn example
* 96dac7e doc: small fixups to README and documentation
* 482e2ff core: set version to 0.3.0