Update README with updated proper instructions

- Updated instructions so that you grab the code before importing install.sql - You can't import something that has not been checked out
- Updated some minor wording. i.e. apache server is now web server and web root is now document root for clarification
added sql debugging to table building (fixes #58)
change checksum to display in hex format (fixes #55)

- in addition all places where checksum is
  passed as a parameter should now handle
  both formats, including search.
- this behavior requires a change to the config.inc.php
  file.  The sample has been updated, but end
  users will have to merge with thier local conf
Merge pull request #57 from kylegato/patch-1

Update README with updated proper instructions
disambiguate column names which exist in both tables ( fixes #54)

- the challenge was to handle many cases:
  + visually we want to display column names without table prefix
  + expressions which alias to a name must be unchanged
  + a couple special fields have to be ignored
  + maintain backwards compatability with get params which
    do not provide exact field names
changed default graph grouping to nearest minute (fixes #60)
clean up bad change to config  (fixes #55)
on graphs, filter out series with no data (fixes #62)
fixed javascript void error on dropdown button