removing file extension restriction

resolves #13

In order to do so, we have to have the ability to ignore certain files that were being generated by the .snag.yml (like the binary generated from 'go build').
ExcludeDirectory was therefore renamed to 'ignore' and behave simlarly to a .gitignore. You can list files or directories and both will be ignored

.snag.yml

@@ -1,7 +1,8 @@
 verbose: true
 
-exclude_directory:
+ignore:
   - .git
+  - snag
 
 script:
   - go build

builder.go

@@ -14,26 +14,18 @@ import (
 	fsn "gopkg.in/fsnotify.v1"
 )
 
-// supported file extensions
-const (
-	GoExt   = ".go"
-	JSONExt = ".json"
-)
-
-var (
-	mtimes    = map[string]time.Time{}
-	buildExts = []string{GoExt, JSONExt}
-)
+var mtimes = map[string]time.Time{}
 
 type Bob struct {
 	w        *fsn.Watcher
 	mtx      sync.RWMutex
 	curVow   *vow.Vow
 	done     chan struct{}
 	watching map[string]struct{}
+	watchDir string
 
 	cmds         [][]string
-	excludedDirs []string
+	ignoredItems []string
 
 	verbose bool
 }
@@ -54,7 +46,7 @@ func NewBuilder(c config) (*Bob, error) {
 		done:         make(chan struct{}),
 		watching:     map[string]struct{}{},
 		cmds:         cmds,
-		excludedDirs: c.ExcludeDirectory,
+		ignoredItems: c.IgnoredItems,
 		verbose:      c.Verbose,
 	}, nil
 }
@@ -65,6 +57,7 @@ func (b *Bob) Close() {
 }
 
 func (b *Bob) Watch(path string) error {
+	b.watchDir = path
 	b.watch(path)
 	b.execute()
 
@@ -96,15 +89,8 @@ func (b *Bob) Watch(path string) error {
 }
 
 func (b *Bob) maybeQueue(path string) {
-	var found bool
-	for _, ext := range buildExts {
-		if filepath.Ext(path) == ext {
-			found = true
-			break
-		}
-	}
-
-	if !found {
+	relPath := strings.TrimPrefix(path, b.watchDir+"/")
+	if b.isExcluded(relPath) {
 		return
 	}
 
@@ -184,7 +170,7 @@ func (b *Bob) watch(path string) bool {
 }
 
 func (b *Bob) isExcluded(name string) bool {
-	for _, n := range b.excludedDirs {
+	for _, n := range b.ignoredItems {
 		if n == name {
 			return true
 		}

main.go

@@ -9,9 +9,9 @@ import (
 )
 
 type config struct {
-	Script           []string `yaml:"script"`
-	ExcludeDirectory []string `yaml:"exclude_directory"`
-	Verbose          bool     `yaml:"verbose"`
+	Script       []string `yaml:"script"`
+	IgnoredItems []string `yaml:"ignore"`
+	Verbose      bool     `yaml:"verbose"`
 }
 
 func main() {