Release 1.5.0

The 1.5 minor series tracks TensorFlow 1.5.

Highlights

New Custom Scalars dashboard, which can display configurable custom line and margin charts based on the same data as the regular Scalars dashboard. See for details: https://github.com/tensorflow/tensorboard/tree/1.5/tensorboard/plugins/custom_scalar
Many projector plugin enhancements thanks to @francoisluus, which enable cognitive-assisted labeling via semi-supervised t-SNE
- t-SNE specific features: semi-supervision (#811) plus perturb (#705) and pause/resume (#691) buttons
- general features: metadata editor (#753), selection edit mode (#697), edit box for neighbors slider (#733), 2D sprite element zooming (#696)

Image dashboard brightness and constrast sliders (#771) - thanks @edmundtong
Top-level dashboard tabs now scroll when there are too many to fit (#730)
Settable browser window title with --window_title flag (#804) - thanks @tkunic
Tag filters are now reflected in the URL, making them saveable (#787)
Pane-based dashboards now only load charts from first two panes by default, which should improve responsiveness (#643 defaults tag filter search string to empty, and #871 makes first two panes open by default)
Lower latency to serve TensorBoard HTML thanks to preloading in memory (#708)
Lazy imports ("import tensorboard as tb") now work for summary APIs (#778)
PR curve summaries now have pb (#633) and raw_data_pb (#646) versions

#265 - fixed --logdir to handle Windows drive letters - thanks @shakedel
#784 - fixed bug in find similar subgraph algo - thanks @trisolaran
Graph plugin fixed to
- correctly render function nodes (#817)
- pan to nodes more reliably (#824, #837)
- rebuild hierarchy if callbacks change to avoid race in rendering (#879)

The 0.4 minor series tracks TensorFlow 1.4.

PR Curve plugin has a full-featured new dashboard (#387, #426, many others)
PR Curve plugin has new streaming and raw summary-writing ops (#520, #587)
Graph plugin has a new "Functions" scene group to show function libraries and links to function calls (#394, #395, #497, #551, others)
Graph plugin metanodes are now colored more helpfully (#467)
Graph plugin selected run is now persisted to URL (#505)
Standard dashboard card header UI is more compact and readable (#430)
Pagination limit can now be configured in settings (#535)
Text plugin now has op and pb summary writing methods (#510)
Reduced boilerplate and cleaner API hooks for custom plugins (#611, #620)
Faster initial loads due to improved active plugin detection (#621, #663)
Reuse of TCP connections with switch to using HTTP/1.1 (#617)