Fix BibLaTeX related issues

This commit...

1. adds toggle comment and fold rules for BibLaTeX
2. removes static file extension assignment, so BibLaTeX syntax is assigned
   only if `use_biblatex` setting is true (as described in docs)
3. fixes order and indentation of xml tag in a snippet

Author: deathaxe

BibLaTeX - Comments.tmPreferences

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<plist version="1.0">
+<dict>
+	<key>scope</key>
+	<string>text.biblatex</string>
+	<key>settings</key>
+	<dict>
+		<key>shellVariables</key>
+		<array>
+			<dict>
+				<key>name</key>
+				<string>TM_COMMENT_START</string>
+				<key>value</key>
+				<string>% </string>
+			</dict>
+		</array>
+	</dict>
+</dict>
+</plist>

BibLaTeX - Fold.tmPreferences

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<plist version="1.0">
+<dict>
+    <key>scope</key>
+    <string>text.bibtex</string>
+    <key>settings</key>
+    <dict>
+        <key>foldScopes</key>
+        <array>
+            <dict>
+                <key>begin</key>
+                <string>punctuation.section.braces.begin</string>
+                <key>end</key>
+                <string>punctuation.section.braces.end</string>
+                <key>excludeTrailingNewlines</key>
+                <false/>
+            </dict>
+            <dict>
+                <key>begin</key>
+                <string>punctuation.section.parens.begin</string>
+                <key>end</key>
+                <string>punctuation.section.parens.end</string>
+                <key>excludeTrailingNewlines</key>
+                <false/>
+            </dict>
+            <dict>
+                <key>begin</key>
+                <string>punctuation.definition.string.begin</string>
+                <key>end</key>
+                <string>punctuation.definition.string.end</string>
+                <key>excludeTrailingNewlines</key>
+                <false/>
+            </dict>
+        </array>
+    </dict>
+</dict>
+</plist>

BibLaTeX.sublime-syntax

@@ -4,9 +4,6 @@
 name: BibLaTeX
 scope: text.biblatex
 
-file_extensions:
-  - bib
-
 contexts:
   main:
     - include: scope:text.bibtex

snippets/biblatex/report.sublime-snippet

@@ -10,6 +10,6 @@
 }
 ]]></content>
 	<tabTrigger>report</tabTrigger>
+	<scope>text.biblatex - meta.entry.braces.bibtex - meta.entry.parenthesis.bibtex - meta.entry.arguments.bibtex</scope>
 	<description>BibLaTeX Report</description>
-		<scope>text.biblatex - meta.entry.braces.bibtex - meta.entry.parenthesis.bibtex - meta.entry.arguments.bibtex</scope>
 </snippet>