Minor installation doc tweaks
Minor installation doc tweaks

 - Update path to solr example config (probably due to changes to solr)
 - Specify full path to openspendingjs
 - Don’t specify solr version number
 - Although “Pong!” is better than “Pong.” it does say “Pong.”

pudo/spendb,nathanhilbert/FPA_Core,spendb/spendb,openspending/spendb,johnjohndoe/spendb,pudo/spendb,spendb/spendb,spendb/spendb,pudo/spendb,openspending/spendb,USStateDept/FPA_Core,johnjohndoe/spendb,nathanhilbert/FPA_Core,nathanhilbert/FPA_Core,CivicVision/datahub,USStateDept/FPA_Core,johnjohndoe/spendb,CivicVision/datahub,USStateDept/FPA_Core,CivicVision/datahub,openspending/spendb