Attempt to upgrade Tika to latest version 1.20.

See issue #66

pom.xml

@@ -196,7 +196,7 @@
 		<dependency>
 			<groupId>org.apache.tika</groupId>
 			<artifactId>tika-parsers</artifactId>
-			<version>1.7</version>
+			<version>1.20</version>
 			<scope>compile</scope>
 
 			<exclusions>
@@ -213,12 +213,6 @@
 					<artifactId>netcdf</artifactId>
 				</exclusion>
 
-				<!-- we don't use Tika to parse HTML so we don't need it's HTML parser -->
-				<exclusion>
-					<groupId>org.ccil.cowan.tagsoup</groupId>
-					<artifactId>tagsoup</artifactId>
-				</exclusion>
-
 				<!-- we don't use Tika to parse Java classes so we don't need ASM -->
 				<exclusion>
 					<groupId>asm</groupId>
@@ -268,10 +262,6 @@
 					<groupId>org.tukaani</groupId>
 					<artifactId>xz</artifactId>
 				</exclusion>
-				<exclusion>
-					<groupId>com.adobe.xmp</groupId>
-					<artifactId>xmpcore</artifactId>
-				</exclusion>
 
 				<!-- exclude stuff that is part of Java 6 core -->
 				<exclusion>
@@ -292,12 +282,6 @@
 					<artifactId>java-libpst</artifactId>
 				</exclusion>
 
-				<!-- we don't support images so we don't need their metadata -->
-				<exclusion>
-					<groupId>com.drewnoakes</groupId>
-					<artifactId>metadata-extractor</artifactId>
-				</exclusion>
-
 			</exclusions>
 
 		</dependency>