subprocess 0.8.2

fixes in test cases for testthat 2.0

subprocess 0.8.1

explicitly register native symbols
Ctrl+C works in Windows
multiple fixes in test code

subprocess 0.8.0

support for Mac OS
shared read from both stdout and stderr of the child process
new process_close_input() call to close the write end of child's standard input pipe; this in most cases will let the child know it should exit
renamed process_poll() to process_wait(); add process_state()
converted shared library to C++
bugfix: group terminate in Windows

subprocess 0.7.4

initial submission to CRAN; basic API works in Linux and Windows