[mousetrap/gnome3-wip: 207/240] Add `make devclean`. Fix comments. Adjust README.md.

[Heidi Ellis <heidiellis src gnome org>]

commit a599d0284c97424b83ebee3ad5d1e590a77eb0d0
Author: Stoney Jackson <dr stoney gmail com>
Date:   Sun Jun 29 10:57:48 2014 -0400

    Add `make devclean`. Fix comments. Adjust README.md.

 Makefile.am |   13 ++++++++++---
 README.md   |    5 +++--
 2 files changed, 13 insertions(+), 5 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index e44e55d..bfa0759 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -73,9 +73,16 @@ distclean-local:
 ##############################################################################
 # TARGET: pristine
 
-pristine:
-       git clean -df   # deletes ignored
-       git clean -Xdf  # deletes untracked
+pristine: devclean
+       git clean -df  # deletes untracked
+
+
+
+##############################################################################
+# TARGET: devclean
+
+devclean:
+       git clean -Xdf  # deletes ignored
 
 
 ##############################################################################
diff --git a/README.md b/README.md
index d0ee598..5b093f9 100644
--- a/README.md
+++ b/README.md
@@ -146,8 +146,9 @@ Makefile targets
 * `run` - runs without install
 * `check` - tests
 * `lint` - style checker
-* `clean` - deletes files created by `all`
-* `pristine` - deletes all ignored or not tracked by git (requires git)
+* `clean` - deletes files created by `make` or `make all`
+* `devclean` - deletes all files ignored by git
+* `pristine` - `devclean` plus deletes all files not tracked by git
 * `dist` - makes distribution
 * `distcheck` - makes and tests distribution
 * `distclean` - cleans extra files generated by `dist`