v5.0.0-beta3

• [all] Streams rewrite, node serialport is now a node stream! 🎉
• [all] Introduce a binding layer to provide a common low level interface to work with different platforms.
• [all] add #get to retrieve modem status flags thanks to @jgillick!
• [all] Add electron precompiled binaries thanks to @Mike-Dax
• [all] Allow node-pre-gyp path and host to be overridden thanks to @thom-nic
• [all] Conform to NodeJS error message formats
• [all] Drop NodeJS 0.10 and 0.12 support
• [all] Fix baud rate parsing in serialport-terminal thanks to @radio-miskovice for reporting it!
• [all] Fix memory leak during opening a port thanks to @indutny
• [all] Refactor internals to make use of es6 and promises
• [all] Remove unnecessary dependencies and polyfills thanks to @mscdex
• [all] Remove v8 deprecation warnings thanks to @indutny again
• [all] Upgrade debug and node-pre-gyp
• [all] Upgrade nan to fix compile issues on some platforms thanks to @thom-nic
• [docs] Add more installation notes on sudo, windows 10, electron and node 7
• [docs] Mark new features in 5.0.0 with the fact they started in 5.0.0
• [windows] Fix file handle leak during opens when errors occur thanks to @enami
• [windows] Refactoring of .list for Windows so it's significantly smaller thanks to @Zensey
• [windows] Rewrite reading so it's pausable thanks to @munyirik