fix(HTML): prevent crashes with css functions, "normal" & "unset" keywords

Author: Exilz

src/HTMLStyles.js

@@ -182,6 +182,9 @@ function cssToRNStyle (css, styleset, { emSize, ptSize, ignoredStyles, allowedSt
             }
 
             if (typeof value === 'string') {
+                if (value.search('inherit') !== -1 || value.search('calc') !== -1 || value.search('normal') !== -1) {
+                    return undefined;
+                }
                 value = value.replace('!important', '');
                 // See if we can use the percentage directly
                 if (value.search('%') !== -1 && PERC_SUPPORTED_STYLES.indexOf(key) !== -1) {

src/HTMLUtils.js

@@ -38,7 +38,8 @@ export const ABSOLUTE_FONT_SIZE = {
     'larger': 16,
     'length': null,
     'initial': null,
-    'inherit': null
+    'inherit': null,
+    'unset': null
 };
 
 export const IGNORED_TAGS = ['head', 'scripts', 'audio', 'video', 'track', 'embed', 'object', 'param', 'source', 'canvas', 'noscript',