Remove superfluous grid line for log scale.

The code removed in this change added an additional entry to the list of
labels, causing the top of the graph to be extended by self.logBase. As
the corresponding labels have already been drawn, the result is a
graph with n+1 gridlines for n labels. Removing this addition resolves
the issue.

Fixes #235.
Attempting Categorization

Taking a stab at categorizing the tools. While I appreciate the list, it has never been particularly useful for me to browse the mixed bag alphabetically; Typically, I am in need of a particular type of tool, and categorization would be more helpful to me.

Also, since it was giving me eyebleed from all of the headers and listing each title twice, I turned them all into RST Definition Lists.

Some opinions were made (monitoring, CollectD/Ganglia/Sensu, the Other category). Sue me.

More bikeshedding could be had, but not terribly useful (chars-per-line, etc)
Fixing missing indentation

Somehow three lines either were missed, or somehow mucked up in the copy.
fixing merge conflict by adding in a new tool, but preserving the original intent of categorizing the tools
fixing merge conflict by adding in a new tool, but preserving the original intent of categorizing the tools
a little more cleanup and consistency
merging in from upstream, resolving merge conflict with docs/tools.rst
Merge branch 'master' into patch-2
Merge pull request #688 from gwaldo/patch-2

Attempting Categorization of Tools and changed formatting
fix toctree by removing extra newline
adding some info missing from the wikidot page to the config-carbon page
fixing some whitespacing between headers in the config-local-settings
first stab at config-local-settings. Attempted to capture info that may be missing from wikidot
adding vim .swp files to gitignore
fixing formatting after a preview
further fixes to formatting
tweaks to the install page's toctree; apparently github can't handle displaying toctrees
Merge pull request #389 from ralphm/log_scale_labels

Remove superfluous grid line for log scale.
Merge branch 'master' into death-to-wikidot
addressing a TravisCI warning that was treated as an error.