0.8.0b2 docs issues

[Ed McDonagh]

• Upgrade offline is a child of 0.7.4 release notes
• -d is not usable with pip install - should probably be pip download -d - I need to check which version that is applicable from.

[Ed McDonagh]

This was discovered in the process of attempting to upgrade to 0.8.0b2, and finding that my version of python (2.7.4) doesn't satisfy the SSL requirements and therefore I had to download and install from a local folder.

[Ed McDonagh]

Added notes about using pip download rather than pip install. Refs #616

→ <<cset 3196f19e7855>>

[Ed McDonagh]

Attempt to set an appropriate parent for upgrade-offline. refs #616

→ <<cset 4bc9321cad99>>

[Ed McDonagh]

Bumping version numbers for 0.8.0b3 release. Also added refs #616, #618 to changes and removed in-page link (hash) from highsoft link as it may be what is causing readme to nor format on PyPI

→ <<cset 03a21540b72f>>

[Ed McDonagh]

Fixed in 4bc9321 and 3196f19e