Revert "trappy: Optimize integer conversion in generate_data_dict"

This reverts commit c0a49a16d85ef5b732fafe02faad73c67df7b665.
diff --git a/trappy/base.py b/trappy/base.py
index 3c4c7bd..4f06af2 100644
--- a/trappy/base.py
+++ b/trappy/base.py
@@ -179,12 +179,6 @@
         self.line_array.append(line)
         self.data_array.append(data)
 
-    def conv_to_int(self, value):
-        # Handle false-positives for negative numbers
-        if value.lstrip("-").isdigit():
-            value = int(value)
-        return value
-
     def generate_data_dict(self, data_str):
         data_dict = {}
         prev_key = None
@@ -196,7 +190,10 @@
                 data_dict[prev_key] += ' ' + field
                 continue
             (key, value) = field.split('=', 1)
-            value = self.conv_to_int(value)
+            try:
+                value = int(value)
+            except ValueError:
+                pass
             data_dict[key] = value
             prev_key = key
         return data_dict