Reworded introduction
Reworded introduction

Reorganised the introduction text, hopefully to provide a more
comprehensible description of what this package is for,
especially for users who don't have previous knowledge of
the SAMP protocol.
lpsinger/astropy,pllim/astropy,larrybradley/astropy,funbaker/astropy,dhomeier/astropy,mhvk/astropy,dhomeier/astropy,bsipocz/astropy,DougBurke/astropy,dhomeier/astropy,stargaser/astropy,aleksandr-bakanov/astropy,astropy/astropy,kelle/astropy,aleksandr-bakanov/astropy,AustereCuriosity/astropy,aleksandr-bakanov/astropy,astropy/astropy,StuartLittlefair/astropy,MSeifert04/astropy,AustereCuriosity/astropy,funbaker/astropy,DougBurke/astropy,pllim/astropy,MSeifert04/astropy,kelle/astropy,kelle/astropy,StuartLittlefair/astropy,MSeifert04/astropy,dhomeier/astropy,lpsinger/astropy,StuartLittlefair/astropy,funbaker/astropy,larrybradley/astropy,larrybradley/astropy,lpsinger/astropy,dhomeier/astropy,mhvk/astropy,stargaser/astropy,StuartLittlefair/astropy,saimn/astropy,larrybradley/astropy,pllim/astropy,mhvk/astropy,mhvk/astropy,bsipocz/astropy,astropy/astropy,saimn/astropy,AustereCuriosity/astropy,funbaker/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,astropy/astropy,MSeifert04/astropy,kelle/astropy,bsipocz/astropy,kelle/astropy,DougBurke/astropy,astropy/astropy,AustereCuriosity/astropy,saimn/astropy,stargaser/astropy,AustereCuriosity/astropy,saimn/astropy,bsipocz/astropy,stargaser/astropy,pllim/astropy,lpsinger/astropy,saimn/astropy,DougBurke/astropy,larrybradley/astropy,mhvk/astropy,pllim/astropy