Fix Execute() ignoring param evaluating to false

When ADOConnection->Execute is called with a single non-array parameter
that evaluates to false, it ignores the parameter.

Fixed by doing a strict-type comparison. Note that single boolean "false"
parameter needs to be passed in as array(false).

Reported by Alejandro Vásquez
Fixes sourceforge patch #32
GetAssoc issue when 2nd column is null

If the second column of the first row happens to be null, ADOdb returned
a one-based array rather than the expected zero-based one.

Resolved by using array_key_exists() instead of isset().

Fixes sourceforge bug #130
Update changelog
MSSQL: change timestamp format to ISO 8601

As recommended on Microsoft TechNet site
http://technet.microsoft.com/en-us/library/ms180878%28v=sql.105%29.aspx#StringLiteralDateandTimeFormats
Added initial Composer config file

This is the original composer.json file from
https://github.com/cvele/adodb
Remove 'version'
Added 'description'
Added 'keywords'
Move 'homepage' to root
Update 'authors'
Update 'support' section

Added Github issues and source, removed forums
Added Composer support
Fix syntax error in composer.json
Update changelog
Adding Sourceforge web site HTML pages

Files from http://adodb.sourceforge.net
Layout and CSS adjustments
Remove references to unmaintained Python library
Remove references to obsolete 'extension'
Layout of inline style
HTML layout