test: Document revision parsing as feature test

Author: kalkin

features/revision-parsing.feature

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+Feature: Parse revision specified on command line
+
+    Scenario: HEAD
+        Given command line: glv HEAD
+        Then found revision
+
+    Scenario: Branch
+        Given command line: glv master
+        Then found revision
+
+    Scenario: Short Commit
+        Given command line: glv 03de9b6
+        Then found revision
+
+    Scenario: Short Commit Range
+        Given command line: glv 840a98e..03de9b6
+        When found revision
+        Then revision log has 9 commits
+
+    Scenario: Open Range
+        Given command line: glv 840a98e..
+        When found revision
+        Then revision log has more then 9 commits
+
+    Scenario: HEAD Range
+        Given command line: glv HEAD~2..HEAD
+        When found revision
+        Then revision log has 2 commits
+
+    Scenario: HEAD Open range
+        Given command line: glv HEAD~2..
+        When found revision
+        Then revision log has 2 commits