Improve commit messages in 01-backup

We probably don't want to get into the details of good commit message style
in this lesson, but we should try to model it as best as possible. This updates
the commit messages to make them a little better/more standard.

01-backup.md

@@ -222,10 +222,10 @@ To get it to do that,
 we need to run one more command:
 
 ~~~ {.bash}
-$ git commit -m "Starting to think about Mars"
+$ git commit -m "Start notes on Mars as a base"
 ~~~
 ~~~ {.output}
-[master (root-commit) f22b25e] Starting to think about Mars
+[master (root-commit) f22b25e] Start notes on Mars as a base
  1 file changed, 1 insertion(+)
  create mode 100644 mars.txt
 ~~~
@@ -265,7 +265,7 @@ commit f22b25e3233b4645dabd0d81e651fe074bd8e73b
 Author: Vlad Dracula <vlad@tran.sylvan.ia>
 Date:   Thu Aug 22 09:51:46 2013 -0400
 
-    Starting to think about Mars
+    Start notes on Mars as a base
 ~~~
 
 `git log` lists all revisions  made to a repository in reverse chronological order.
@@ -297,7 +297,7 @@ $ cat mars.txt
 ~~~
 ~~~ {.output}
 Cold and dry, but everything is my favorite color
-The two moons may be a problem for Wolfman
+Add concerns about effects of Mars' moons on Wolfman
 ~~~
 
 When we run `git status` now,
@@ -338,7 +338,7 @@ index df0654a..315bf3a 100644
 +++ b/mars.txt
 @@ -1 +1,2 @@
  Cold and dry, but everything is my favorite color
-+The two moons may be a problem for Wolfman
++Add concerns about effects of Mars' moons on Wolfman
 ~~~
 
 The output is cryptic because
@@ -419,7 +419,7 @@ $ cat mars.txt
 ~~~
 ~~~ {.output}
 Cold and dry, but everything is my favorite color
-The two moons may be a problem for Wolfman
+Add concerns about effects of Mars' moons on Wolfman
 But the Mummy will appreciate the lack of humidity
 ~~~
 ~~~ {.bash}
@@ -432,7 +432,7 @@ index 315bf3a..b36abfd 100644
 +++ b/mars.txt
 @@ -1,2 +1,3 @@
  Cold and dry, but everything is my favorite color
- The two moons may be a problem for Wolfman
+ Add concerns about effects of Mars' moons on Wolfman
 +But the Mummy will appreciate the lack of humidity
 ~~~
 
@@ -464,7 +464,7 @@ index 315bf3a..b36abfd 100644
 +++ b/mars.txt
 @@ -1,2 +1,3 @@
  Cold and dry, but everything is my favorite color
- The two moons may be a problem for Wolfman
+ Add concerns about effects of Mars' moons on Wolfman
 +But the Mummy will appreciate the lack of humidity
 ~~~
 
@@ -474,10 +474,10 @@ and what's in the staging area.
 Let's save our changes:
 
 ~~~ {.bash}
-$ git commit -m "Thoughts about the climate"
+$ git commit -m "Add discussion of Mars' climate"
 ~~~
 ~~~ {.output}
-[master 005937f] Thoughts about the climate
+[master 005937f] Add discussion of Mars' climate
  1 file changed, 1 insertion(+)
 ~~~
 
@@ -501,7 +501,7 @@ commit 005937fbe2a98fb83f0ade869025dc2636b4dad5
 Author: Vlad Dracula <vlad@tran.sylvan.ia>
 Date:   Thu Aug 22 10:14:07 2013 -0400
 
-    Thoughts about the climate
+    Add discussion of Mars' climate
 
 commit 34961b159c27df3b475cfe4415d94a6d1fcd064d
 Author: Vlad Dracula <vlad@tran.sylvan.ia>
@@ -513,7 +513,7 @@ commit f22b25e3233b4645dabd0d81e651fe074bd8e73b
 Author: Vlad Dracula <vlad@tran.sylvan.ia>
 Date:   Thu Aug 22 09:51:46 2013 -0400
 
-    Starting to think about Mars
+    Start notes on Mars as a base
 ~~~
 
 To recap, when we want to add changes to our repository,
@@ -540,7 +540,7 @@ index 315bf3a..b36abfd 100644
 +++ b/mars.txt
 @@ -1,2 +1,3 @@
  Cold and dry, but everything is my favorite color
- The two moons may be a problem for Wolfman
+ Add concerns about effects of Mars' moons on Wolfman
 +But the Mummy will appreciate the lack of humidity
 ~~~
 ~~~ {.bash}
@@ -553,7 +553,7 @@ index df0654a..b36abfd 100644
 +++ b/mars.txt
 @@ -1 +1,3 @@
  Cold and dry, but everything is my favorite color
-+The two moons may be a problem for Wolfman
++Add concerns about effects of Mars' moons on Wolfman
 +But the Mummy will appreciate the lack of humidity
 ~~~
 
@@ -586,7 +586,7 @@ index df0654a..b36abfd 100644
 +++ b/mars.txt
 @@ -1 +1,3 @@
  Cold and dry, but everything is my favorite color
-+The two moons may be a problem for Wolfman
++Add concerns about effects of Mars' moons on Wolfman
 +But the Mummy will appreciate the lack of humidity
 ~~~
 
@@ -604,7 +604,7 @@ index df0654a..b36abfd 100644
 +++ b/mars.txt
 @@ -1 +1,3 @@
  Cold and dry, but everything is my favorite color
-+The two moons may be a problem for Wolfman
++Add concerns about effects of Mars' moons on Wolfman
 +But the Mummy will appreciate the lack of humidity
 ~~~
 
@@ -649,7 +649,7 @@ $ cat mars.txt
 ~~~
 ~~~ {.output}
 Cold and dry, but everything is my favorite color
-The two moons may be a problem for Wolfman
+Add concerns about effects of Mars' moons on Wolfman
 But the Mummy will appreciate the lack of humidity
 ~~~