upgrade notes 0.3.4 -> 0.3.5
added version upgrade notes to readme links
use https rubygems
Merge pull request #29 from cokernel/use_https_rubygems

use https rubygems
updated template gemfile opal commit to match
vector benchmarking made consistent for destructive methods
fixed Vector#toward, clarified Vector#toward!
Vector#toward(!) benchmarks
Vector: #add(!), #subtract(!), #multiply(!), #divide(!), additional benchmarks
Vector#+@ is an alias of #dup
updated display interface test
Vector#==
improved vector interface test
vector: tests, tweaked docs, fixed #along