Adding support for WriteQueueLimitLow & WriteQueueLimitHigh, which were added in collectd 5.4
curl : 'MeasureResponseTime' needs exactly one boolean argument

Removing double quotes avoid this error.
Use '@plugininstance' to avoid warning message about deprecation
Merge pull request #178 from joshgarnett/master

Adding support for WriteQueueLimitLow & WriteQueueLimitHigh
Merge pull request #191 from bdossantos/fix/curl_MeasureResponseTime

curl : 'MeasureResponseTime' needs exactly one boolean argument