v0.3.0-beta.3

Some big updates finally done, nearing first version of public release

• Core logic rewrite: nodeminer will now poll all configured miners every interval on the server side instead of spawning a new thread each time a client connects. Updates will only be emitted when a socket connection is created
• Scrapped the bfgminer module and implemented xgminer module for all interaction with c/bf/sgminer (module maintained separately)
• Made Dashboard page more mobile friendly, tables will now get a scrollbar when content doesn't fit the screen
• On-the-fly under/overclocking of GPUs from the Dashboard - you can now dynamically change the Engine Speed, Memory Clock, Voltage & Intensity
• Lots of visual tweaks and enhancements
• Validation added to all forms/input fields
• Added estimated rejected hashrate to Dashboard
• Bug fix: estimated hashrate will now adjust when a miner goes offline