Gitignore coverage and IDE files

Author: Aaron Spiegel

.gitignore

@@ -66,6 +66,7 @@ anaconda-mode/
 # Test binary, build with 'go test -c'
 *.test
 # Output of the go coverage tool, specifically when used with LiteIDE
+coverage.txt
 *.out
 ### Vim ###
 # swap
@@ -81,3 +82,4 @@ tags
 .vscode/*
 .history
 # End of https://www.gitignore.io/api/go,vim,emacs,visualstudiocode
+*.iml