Cosmetic change in instructions (adding colon)

you'll probably need to launch bitcoind as follows: - > Before
you'll probably need to launch bitcoind as follows:: - > After
Added space to command for better visibility

Before: "bitcoind getinfo|grep blocks"
After: "bitcoind getinfo | grep blocks"
Update reqs.txt
Fixed formatting issue in the Windows section
Update README.md
Merge pull request #12 from rippler/patch-4

Cosmetic formatting change in instructions (adding colon to line)
Merge pull request #13 from rippler/patch-5

Added space to command for better visibility
Merge pull request #15 from rippler/patch-7

Update reqs.txt
Merge pull request #17 from rippler/patch-9

Fixed formatting issue in the Windows section
Merge branch 'master' into develop