Merge pull request #22 from chengchengcode/patch-7

Merge pull request #21 from chengchengcode/patch-6

Merge pull request #20 from chengchengcode/patch-5

Merge pull request #19 from chengchengcode/patch-3

Merge pull request #18 from chengchengcode/patch-2

Merge pull request #17 from chengchengcode/patch-1

Update extragalactic_astronomy.md

Update radio_submm_astrophy.md

Update transient_and_time_domain.md

Update stellar_and_spops.md

Update photoz.md

Update ism_and_dust.md

Merge pull request #8 from pcubillos/writing_tools_bm

Add dynamic modeling codes"

Add documents for spec-surveys