Remove outdated legit commands. (stevemao#30)

Recent versions of legit removed these commands.

See: https://github.com/frostming/legit/blob/master/legit/cli.py

README.md

@@ -1245,25 +1245,6 @@ Fast-forwarded 4.0 to origin/4.0.
 Pushing commits to the server.
 ```
 
-### resync
-
-```
-$ git resync
-Switching to master.
-Your branch is ahead of 'origin/master' by 10 commits.
-  (use "git push" to publish your local commits)
-Pulling commits from the server.
-Already up-to-date.
-Switching to master.
-Your branch is ahead of 'origin/master' by 10 commits.
-  (use "git push" to publish your local commits)
-Grafting commits from master.
-Already up-to-date.
-Pulling commits from the server.
-Already up-to-date.
-Pushing commits to the server.
-```
-
 ### switch
 
 ```
@@ -1286,45 +1267,6 @@ no changes added to commit (use "git add" and/or "git commit -a")
 Dropped stash@{0} (86f5dc9066ff9f69c01c77e2f5a55643ad19f8f2)
 ```
 
-### sprout
-
-```
-$ git sprout development
-Branching master to development.
-```
-
-### harvest
-
-```
-$ git harvest development
-Grafting commits from development.
-Updating e4f08f4..64b3563
-Fast-forward
- package.json | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-Restoring local changes.
-On branch master
-Your branch is ahead of 'origin/master' by 1 commit.
-  (use "git push" to publish your local commits)
-nothing to commit, working directory clean
-Dropped stash@{0} (7c28b7f5eaf09dd72ec6e1ea440cbd1611e36c7f)
-```
-
-### graft
-
-```
-$ git graft development
-Switching to master.
-Your branch is ahead of 'origin/master' by 2 commits.
-  (use "git push" to publish your local commits)
-Grafting development into master.
-Merge made by the 'recursive' strategy.
- feature | 0
- 1 file changed, 0 insertions(+), 0 deletions(-)
- create mode 100644 feature
-Deleted branch development (was 6a022ba).
-```
-
 ### publish
 
 ```