Update .gitignore and adding yarn.lock (gregnb#1004)

.gitignore

@@ -5,6 +5,11 @@
 logs
 *.log
 npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
 
 # sublime project
 *.sublime-project
@@ -20,13 +25,15 @@ npm-debug.log*
 pids
 *.pid
 *.seed
+*.pid.lock
 
 # Directory for instrumented libs generated by jscoverage/JSCover
 lib-cov
 
 # Coverage directory used by tools like istanbul
 coverage
 .nyc_output/
+*.lcov
 
 # Compiled binary addons (http://nodejs.org/api/addons.html)
 build/Release
@@ -37,6 +44,9 @@ node_modules
 # Optional npm cache directory
 .npm
 
+# Optional eslint cache
+.eslintcache
+
 # Build Data
 dist/*
 es/*
@@ -49,3 +59,15 @@ docs/export/*
 
 # Optional REPL history
 .node_repl_history
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+
+# Yarn Integrity file
+.yarn-integrity
+
+# Yarn lock
+# Note: 
+# Remove the line below when we switched to Yarn
+yarn.lock