Omit files and print only match options added

These are essential for using the tool for scripting purposes.

src/config.rs

@@ -7,6 +7,8 @@ pub struct Config {
     pub ignore_case: bool,
     pub path: String,
     pub use_gitignore: bool,
+    pub omit_filenames: bool,
+    pub match_only: bool,
 }
 
 impl Config {
@@ -36,6 +38,16 @@ impl Config {
                     .long("no-gitignore")
                     .help("Include results that are specified in .gitignore"),
             )
+            .arg(
+                Arg::with_name("omit filenames")
+                    .short("h")
+                    .help("Omit file names in results"),
+            )
+            .arg(
+                Arg::with_name("only match")
+                    .short("o")
+                    .help("Only print matched text")
+            )
             .get_matches();
 
         Config {
@@ -43,6 +55,8 @@ impl Config {
             ignore_case: matches.is_present("ignore case"),
             path: String::from(matches.value_of("path").unwrap()),
             use_gitignore: !matches.is_present("gitignore"),
+            omit_filenames: matches.is_present("omit filenames"),
+            match_only: matches.is_present("only match"),
         }
     }
 }