Feature - Add initial ePIC UMC support (#71)

* prelim support of ePIC UMC

* slowly adding things

* add most api calls

* add some guards

* fix post commands

* remove print

* catch when API returns error

* missing guard

* remove semicolon

* recommended changes

* add docs and changes

* respect ignore_errors

docs/miners/backends/epic.md

@@ -0,0 +1,8 @@
+# pyasic
+## ePIC Backend
+
+::: pyasic.miners.backends.epic.ePIC
+    handler: python
+    options:
+        show_root_heading: false
+        heading_level: 4